bn:01081942n
Noun Named Entity
Categories: Harv and Sfn no-target errors, Axiom of choice, Properties of groups, Theorems in algebra
EN
Nielsen–Schreier theorem  Nielsen-Schreier Theorem  Nielsen-Schreier  Nielsen-Schreier formula  Nielsen–Schreier formula
EN
In group theory, a branch of mathematics, the Nielsen–Schreier theorem states that every subgroup of a free group is itself free. Wikipedia
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EN
In group theory, a branch of mathematics, the Nielsen–Schreier theorem states that every subgroup of a free group is itself free. Wikipedia
Theorem that every subgroup of a free group is itself free Wikidata