Form equivalence class Howard-Rubin Number: 1
Statement:
Strong Nielsen-Schreier Theorem II: If \(G\) is a group which is freely generated by \(X\) and \(U\) is a subgroup of \(G\),then there is a subset \(A\) of \(G\) which freely generates \(U\) and is level with respect to \(X\).
Howard-Rubin number: 1 BB
Citations (articles):
Howard [1985]
Subgroups of a free group and the axiom of choice
Connections (notes):
Note [129]
In this note we give definitions concerning
free groups for forms [1 BB], [1 CA], Form 68 and Form 348.
References (books):
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