Round 8: Tossup 7

A finite extension of the rationals has a property of this name if and only if it is contained in a cyclotomic field. The Mordell-Weil theorem (-5[1])applies to structures like elliptic curves that have a property of this name when considered as varieties. For a group to be solvable, each quotient group in its subnormal series (-5[1])must have a property of this name. If a group has a property of this name, its torsion elements form a subgroup, and it equals its own (*) center. By a fundamental theorem, finite groups with that property of this name are the direct sum of cyclic groups of prime power order. If a group has a property of this name, its Cayley table is symmetric and any conjugation is the identity; such groups include (10[1])Z/nZ (“Z-mod-n-Z”). For 10 points, a group whose binary operation is commutative (10[1])has what property named for a Norwegian (10[1])mathematician? (10[1])■END■ (10[1])

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