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A group (chosen randomly, the groups with 6 and those 8 elements are available) is given by its multiplication table. The task is to check whether the group is commutative, to identify all elements of order 2, and to find a subgroup which has half as many elements as the given group.

(In German.)

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    Taxonomy: mathcentre

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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Ulrich Görtz 4 years, 4 months ago

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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Ulrich Görtz 4 years, 4 months ago

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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Ulrich Görtz 4 years, 4 months ago

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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Name Type Generated Value
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            groups list
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Nested 7×5 list
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            gp list
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            List of 5 items
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            table matrix
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Matrix of size 8×8
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            name string
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            C8
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            is_commutative boolean
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            true
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            symbols list
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            List of 8 items
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            order number
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            8
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            elts_of_order2 set
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            set(5,1)
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            subgp set
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            set(1,3,5,7)
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            latex_table string
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            \begin\{array\}\{c|cccccccc\}
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            tt boolean
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            false

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Describe what this variable represents, and list any assumptions made about its value.

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Generated value: list

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            [ [ "C6", [ [ 1, 2, 3, 4, 5, 6 ], [ 2, 3, 4, 5, 6, 1 ], [ 3, 4, 5, 6, 1, 2 ], [ 4, 5, 6, 1, 2, 3 ], [ 5, 6, 1, 2, 3, 4 ], [ 6, 1, 2, 3, 4, 5 ] ], true, [ 4 ], [ 1, 3, 5 ] ], [ "S3", [ [ 1, 2, 3, 4, 5, 6 ], [ 2, 3, 1, 6, 4, 5 ], [ 3, 1, 2, 5, 6, 4 ], [ 4, 5, 6, 1, 2, 3 ], [ 5, 6, 4, 3, 1, 2 ], [ 6, 4, 5, 2, 3, 1 ] ], false, [ 4, 5, 6 ], [ 1, 2, 3 ] ], [ "C8", [ [ 1, 2, 3, 4, 5, 6, 7, 8 ], [ 2, 3, 4, 5, 6, 7, 8, 1 ], [ 3, 4, 5, 6, 7, 8, 1, 2 ], [ 4, 5, 6, 7, 8, 1, 2, 3 ], [ 5, 6, 7, 8, 1, 2, 3, 4 ], [ 6, 7, 8, 1, 2, 3, 4, 5 ], [ 7, 8, 1, 2, 3, 4, 5, 6 ], [ 8, 1, 2, 3, 4, 5, 6, 7 ] ], true, [ 5 ], [ 1, 3, 5, 7 ] ], [ "C4C2", [ [ 1, 2, 3, 4, 5, 6, 7, 8 ], [ 2, 3, 4, 1, 6, 7, 8, 5 ], [ 3, 4, 1, 2, 7, 8, 5, 6 ], [ 4, 1, 2, 3, 8, 5, 6, 7 ], [ 5, 6, 7, 8, 1, 2, 3, 4 ], [ 6, 7, 8, 5, 2, 3, 4, 1 ], [ 7, 8, 5, 6, 3, 4, 1, 2 ], [ 8, 5, 6, 7, 4, 1, 2, 3 ] ], true, [ 3, 5, 7 ], [ 1, 2, 3, 4 ] ], [ "C2C2C2", [ [ 1, 2, 3, 4, 5, 6, 7, 8 ], [ 2, 1, 4, 3, 6, 5, 8, 7 ], [ 3, 4, 1, 2, 7, 8, 5, 6 ], [ 4, 3, 2, 1, 8, 7, 6, 5 ], [ 5, 6, 7, 8, 1, 2, 3, 4 ], [ 6, 5, 8, 7, 2, 1, 4, 3 ], [ 7, 8, 5, 6, 3, 4, 1, 2 ], [ 8, 7, 6, 5, 4, 3, 2, 1 ] ], true, [ 2, 3, 4, 5, 6, 7, 8 ], [ 1, 2, 3, 4 ] ], [ "D8", [ [ 1, 2, 3, 4, 5, 6, 7, 8 ], [ 2, 3, 4, 1, 8, 5, 6, 7 ], [ 3, 4, 1, 2, 7, 8, 5, 6 ], [ 4, 1, 2, 3, 6, 7, 8, 5 ], [ 5, 6, 7, 8, 1, 2, 3, 4 ], [ 6, 7, 8, 5, 4, 1, 2, 3 ], [ 7, 8, 5, 6, 3, 4, 1, 2 ], [ 8, 5, 6, 7, 2, 3, 4, 1 ] ], false, [ 3, 5, 6, 7, 8 ], [ 1, 2, 3, 4 ] ], [ "Q", [ [ 1, 2, 3, 4, 5, 6, 7, 8 ], [ 2, 5, 4, 7, 6, 1, 8, 3 ], [ 3, 8, 5, 2, 7, 4, 1, 6 ], [ 4, 3, 6, 5, 8, 7, 2, 1 ], [ 5, 6, 7, 8, 1, 2, 3, 4 ], [ 6, 1, 8, 3, 2, 5, 4, 7 ], [ 7, 4, 1, 6, 3, 8, 5, 2 ], [ 8, 7, 2, 1, 4, 3, 6, 5 ] ], false, [ 5 ], [ 1, 3, 5, 7 ] ] ]
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Ist die Gruppe G kommutativ?


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