2 results.
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Question in Julia Goedecke's contributions
Student decides on four different examples whether two subspaces form a direct sum and whether the sum is the whole vectorspace.
No randomisation, just the four examples. The question is set in explore mode, so that after deciding, students are asked to give reasons for their choices.
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Question in Matrices Questions
Given two ordered sets of vectors S,T in R5 find the reduced echelon form of the matrices given by S and T and hence determine whether or not they span the same subspace.