- #1
waht
- 1,501
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This is something I understood before, but for some reason I forgot it. How do you prove this inequality holds, if f is injective?
[tex] A_0 \subset f^{-1}(f(A_0)) [/tex]
[tex] A_0 \subset f^{-1}(f(A_0)) [/tex]
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