In the book Encyclopaedia of Mathematics, Vol. 6,
Question: I do not understand the part
Does this mean $F_1\circ f_0=f_1: X\to Y$ or as subsets of $Y$, $$ \{y\in F_1(f_0(X))\}=\{y\in f_1(X)\}? $$
2026-03-28 09:32:55.1774690375
isotopy equivalence of maps
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