Theorem rngmgp 41878

Description: A non-unital ring is a semigroup under multiplication. (Contributed by AV, 17-Feb-2020.)

Hypothesis

Ref	Expression
rngmgp.g	|- G = (mulGrp ` R )

Assertion

Ref	Expression
rngmgp	|- ( R e. Rng -> G e. SGrp )

Proof of Theorem rngmgp

Dummy variables x y z are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqid 2622	. . 3 |- ( Base ` R ) = ( Base ` R )
2		rngmgp.g	. . 3 |- G = (mulGrp ` R )
3		eqid 2622	. . 3 |- ( +g ` R ) = ( +g ` R )
4		eqid 2622	. . 3 |- ( .r ` R ) = ( .r ` R )
5	1, 2, 3, 4	isrng 41876	. 2 |- ( R e. Rng <-> ( R e. Abel /\ G e. SGrp /\ A. x e. ( Base ` R ) A. y e. ( Base ` R ) A. z e. ( Base ` R ) ( ( x ( .r ` R ) ( y ( +g ` R ) z ) ) = ( ( x ( .r ` R ) y ) ( +g ` R ) ( x ( .r ` R ) z ) ) /\ ( ( x ( +g ` R ) y ) ( .r ` R ) z ) = ( ( x ( .r ` R ) z ) ( +g ` R ) ( y ( .r ` R ) z ) ) ) ) )
6	5	simp2bi 1077	1 |- ( R e. Rng -> G e. SGrp )

Syntax hints:   -> wi 4   /\ wa 384   = wceq 1483   e. wcel 1990   A.wral 2912   ` cfv 5888  (class class class)co 6650   Basecbs 15857   +g cplusg 15941   .rcmulr 15942  SGrpcsgrp 17283   Abelcabl 18194  mulGrpcmgp 18489  Rngcrng 41874

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-nul 4789

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-iota 5851  df-fv 5896  df-ov 6653  df-rng0 41875

This theorem is referenced by:  isringrng  41881  rngcl  41883  isrnghmmul  41893  idrnghm  41908  c0rnghm  41913