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• CommentRowNumber1.
• CommentAuthorMarek897
• CommentTimeMar 19th 2022
• (edited Mar 19th 2022)
How prove that for two morphisms f, ψ : F → G of sheaves of sets on a topological space X if f = ψ if and only if f, ψ induces the same maps on stalks.
Deduce that a morphism of sheaves of sets on X is an epimorphism if and only if it is onto on stalks.

I don't know how I should prove it.