Freeness is subgroup-closed

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This article gives the statement, and possibly proof, of a group property (i.e., free group) satisfying a group metaproperty (i.e., subgroup-closed group property)
View all group metaproperty satisfactions | View all group metaproperty dissatisfactions |Get help on looking up metaproperty (dis)satisfactions for group properties
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Statement

Every subgroup of a free group is again a free group.

Related facts

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