Theorem rngimrnghm

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

	Ref	Expression
Hypotheses	rnghmf1o.b	|- B = ( Base ` R )
	rnghmf1o.c	|- C = ( Base ` S )
Assertion	rngimrnghm	|- ( F e. ( R RngIsom S ) -> F e. ( R RngHomo S ) )

Proof

Step	Hyp	Ref	Expression
1		rnghmf1o.b	|- B = ( Base ` R )
2		rnghmf1o.c	|- C = ( Base ` S )
3		rngimrcl	|- ( F e. ( R RngIsom S ) -> ( R e. _V /\ S e. _V ) )
4	1 2	isrngim	|- ( ( R e. _V /\ S e. _V ) -> ( F e. ( R RngIsom S ) <-> ( F e. ( R RngHomo S ) /\ F : B -1-1-onto-> C ) ) )
5		simpl	|- ( ( F e. ( R RngHomo S ) /\ F : B -1-1-onto-> C ) -> F e. ( R RngHomo S ) )
6	4 5	syl6bi	|- ( ( R e. _V /\ S e. _V ) -> ( F e. ( R RngIsom S ) -> F e. ( R RngHomo S ) ) )
7	3 6	mpcom	|- ( F e. ( R RngIsom S ) -> F e. ( R RngHomo S ) )