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Question Number 161205 by mathocean1 last updated on 14/Dec/21

S o i t f : E \to F u n e a p p l i c a t i o n .

P (E) e s t l^{'} e n s e m b l e d e s p a r t i e s

d e E . M o n t r e r q u e :

f e s t s u r j e c t i v e \Leftrightarrow \forall B \in P (E), f (f^{- 1} (B)) = B .