“NielsenSchreierTheorem”的概念、定义、习题解题方法及翻译-数学辞典

单词	NielsenSchreierTheorem
释义	Nielsen-Schreier theorem Every subgroup (http://planetmath.org/Subgroup) of a free group is free. This theorem is named after Jakob Nielsen, who in 1921 proved that every subgroup of a free group of finite rank (http://planetmath.org/FreeGroup) is free, and Otto Schreier, who proved the full result in 1927.
随便看	antipodal map on S^n is homotopic to the identity if and only if n is odd Antiprism antiprism Antisymmetric antisymmetric AntisymmetricMapping antisymmetric mapping AntonsCongruence Anton’s congruence AnyDivisorIsGcdOfTwoPrincipalDivisors any divisor is gcd of two principal divisors AnyNonzeroIntegerIsQuadraticResidue any nonzero integer is quadratic residue AnyRationalNumberIsASumOfUnitFractions any rational number is a sum of unit fractions AnysigmafiniteMeasureIsEquivalentToAProbabilityMeasure AnyTopologicalSpaceWithTheFixedPointPropertyIsConnected any topological space with the fixed point property is connected any σ-finite measure is equivalent to a probability measure ApartnessRelation apartness relation APathologicalFunctionOfRiemann a pathological function of Riemann AperysConstant ApolloniusCircle

数学辞典收录了18232条数学词条，基本涵盖了常用数学知识及数学英语单词词组的翻译及用法，是数学学习的有利工具。

Nielsen-Schreier theorem