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Metamath Proof Explorer

Theorem isrngim2

Description: An isomorphism of non-unital rings is a bijective homomorphism. (Contributed by AV, 23-Feb-2020)

Ref Expression
Hypotheses rnghmf1o.b 
|- B = ( Base ` R )
rnghmf1o.c 
|- C = ( Base ` S )
Assertion isrngim2 
|- ( ( R e. V /\ S e. W ) -> ( F e. ( R RngIso S ) <-> ( F e. ( R RngHom S ) /\ F : B -1-1-onto-> C ) ) )

Proof

Step Hyp Ref Expression
1 rnghmf1o.b 
 |-  B = ( Base ` R )
2 rnghmf1o.c 
 |-  C = ( Base ` S )
3 isrngim 
 |-  ( ( R e. V /\ S e. W ) -> ( F e. ( R RngIso S ) <-> ( F e. ( R RngHom S ) /\ `' F e. ( S RngHom R ) ) ) )
4 1 2 rnghmf1o 
 |-  ( F e. ( R RngHom S ) -> ( F : B -1-1-onto-> C <-> `' F e. ( S RngHom R ) ) )
5 4 bicomd 
 |-  ( F e. ( R RngHom S ) -> ( `' F e. ( S RngHom R ) <-> F : B -1-1-onto-> C ) )
6 5 a1i 
 |-  ( ( R e. V /\ S e. W ) -> ( F e. ( R RngHom S ) -> ( `' F e. ( S RngHom R ) <-> F : B -1-1-onto-> C ) ) )
7 6 pm5.32d 
 |-  ( ( R e. V /\ S e. W ) -> ( ( F e. ( R RngHom S ) /\ `' F e. ( S RngHom R ) ) <-> ( F e. ( R RngHom S ) /\ F : B -1-1-onto-> C ) ) )
8 3 7 bitrd 
 |-  ( ( R e. V /\ S e. W ) -> ( F e. ( R RngIso S ) <-> ( F e. ( R RngHom S ) /\ F : B -1-1-onto-> C ) ) )