Question

Feit and Thompson showed every finite group whose order has this property is solvable. For 10 points each:
[10m] Name this property possessed by permutations whose sign is negative. Functions with this property satisfy [read slowly] f of minus x equals minus f of x.
ANSWER: oddness
[10h] A group is solvable if it has a sequence described by the sub-form of this property whose quotients are abelian. Quotient groups are well defined for subgroups described by this word, which are invariant under conjugation.
ANSWER: normal subgroups [accept subnormal sequence]
[10e] All subgroups are normal for abelian groups, whose binary operations have this property. Matrix multiplication lacks this property, which a binary operation has if a times b always equals b times a.
ANSWER: commutativity [or commutative]
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Summary

2024 ACF Fall at CornellfallY915.5689%56%11%
2024 ACF Fall at Ohio StatefallY812.5088%38%0%
2024 ACF Fall at WashingtonfallY615.00100%50%0%
2024 ACF Fall at GeorgiafallY1119.09100%64%27%
2024 ACF Fall at North CarolinafallY98.8967%11%11%
2024 ACF Fall at Claremont CollegesfallY520.00100%100%0%
2024 ACF Fall at RutgersfallY817.5088%50%38%
2024 ACF Fall at IllinoisfallY918.8989%89%11%

Data

Jefferson County Scholars (DII)Miami B (UG) 001010
Michigan A (UG) CWRU C (UG)1001020
Michigan D (UG)Michigan B (UG)1001020
Michigan C West Virginia A (UG) 001010
Miami C (DII) Michigan State A 0000
Ohio State A (UG) West Virginia B (UG) 001010
Ohio State B (DII) CWRU A (UG) 1001020
Miami A (UG) Ohio State C (DII) 001010