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La $A=\\{\\var{a},\\var{b},\\var{c}\\}$ og $B=\\{\\var{a},\\var{c}\\}$.

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Svarene står ovenfor, men la oss raskt forklare symbolene. $\\in$ betyr ‹element›, og $\\var{a}\\in B$ spør enkelt og greit om $\\var{a}$ er et element i $B$. Med andre ord om $\\var{a}$ er inneholdt i $B$Symbolet $\\subseteq$ minner om krokodillemunnen fra barneskolen, og betyr delmengde eller undermengde$B\\subseteq A$ spør om alle elementene i $A$ er inneholdt i $B$,dersom dette er sant er $A$ en undermengde av $B$.

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Hvilke utsagn er sanne?

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