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[tex]A_0 \subset f^{-1} (f (A_0)) [/tex]
This inclusion is an equality if f is injective.
What I can't understand is how it is even defined if f isn't a bijection. If it is not a bijection, then there is no inverse function. Is there?
This inclusion is an equality if f is injective.
What I can't understand is how it is even defined if f isn't a bijection. If it is not a bijection, then there is no inverse function. Is there?