Theorem ringinvnz1ne0 13018

Description: In a unitary ring, a left invertible element is different from zero iff .1. =/= .0.. (Contributed by FL, 18-Apr-2010.) (Revised by AV, 24-Aug-2021.)

Hypotheses

Ref	Expression
ringinvnzdiv.b	|- B = ( Base ` R )
ringinvnzdiv.t	|- .x. = ( .r ` R )
ringinvnzdiv.u	|- .1. = ( 1r ` R )
ringinvnzdiv.z	|- .0. = ( 0g ` R )
ringinvnzdiv.r	|- ( ph -> R e. Ring )
ringinvnzdiv.x	|- ( ph -> X e. B )
ringinvnzdiv.a	|- ( ph -> E. a e. B ( a .x. X ) = .1. )

Assertion

Ref	Expression
ringinvnz1ne0	|- ( ph -> ( X =/= .0. <-> .1. =/= .0. ) )

Distinct variable groups:   X, a   .0. , a   .1. , a   .x. , a   ph, a

Allowed substitution hints:   B( a)   R( a)

Proof of Theorem ringinvnz1ne0

Step	Hyp	Ref	Expression
1		oveq2 5873	. . . . 5 |- ( X = .0. -> ( a .x. X ) = ( a .x. .0. ) )
2		ringinvnzdiv.r	. . . . . . 7 |- ( ph -> R e. Ring )
3		ringinvnzdiv.b	. . . . . . . 8 |- B = ( Base ` R )
4		ringinvnzdiv.t	. . . . . . . 8 |- .x. = ( .r ` R )
5		ringinvnzdiv.z	. . . . . . . 8 |- .0. = ( 0g ` R )
6	3, 4, 5	ringrz 13015	. . . . . . 7 |- ( ( R e. Ring /\ a e. B ) -> ( a .x. .0. ) = .0. )
7	2, 6	sylan 283	. . . . . 6 |- ( ( ph /\ a e. B ) -> ( a .x. .0. ) = .0. )
8		eqeq12 2188	. . . . . . . 8 |- ( ( ( a .x. X ) = .1. /\ ( a .x. .0. ) = .0. ) -> ( ( a .x. X ) = ( a .x. .0. ) <-> .1. = .0. ) )
9	8	biimpd 144	. . . . . . 7 |- ( ( ( a .x. X ) = .1. /\ ( a .x. .0. ) = .0. ) -> ( ( a .x. X ) = ( a .x. .0. ) -> .1. = .0. ) )
10	9	ex 115	. . . . . 6 |- ( ( a .x. X ) = .1. -> ( ( a .x. .0. ) = .0. -> ( ( a .x. X ) = ( a .x. .0. ) -> .1. = .0. ) ) )
11	7, 10	mpan9 281	. . . . 5 |- ( ( ( ph /\ a e. B ) /\ ( a .x. X ) = .1. ) -> ( ( a .x. X ) = ( a .x. .0. ) -> .1. = .0. ) )
12	1, 11	syl5 32	. . . 4 |- ( ( ( ph /\ a e. B ) /\ ( a .x. X ) = .1. ) -> ( X = .0. -> .1. = .0. ) )
13		oveq2 5873	. . . . 5 |- ( .1. = .0. -> ( X .x. .1. ) = ( X .x. .0. ) )
14		ringinvnzdiv.x	. . . . . . 7 |- ( ph -> X e. B )
15		ringinvnzdiv.u	. . . . . . . . . 10 |- .1. = ( 1r ` R )
16	3, 4, 15	ringridm 13000	. . . . . . . . 9 |- ( ( R e. Ring /\ X e. B ) -> ( X .x. .1. ) = X )
17	3, 4, 5	ringrz 13015	. . . . . . . . 9 |- ( ( R e. Ring /\ X e. B ) -> ( X .x. .0. ) = .0. )
18	16, 17	eqeq12d 2190	. . . . . . . 8 |- ( ( R e. Ring /\ X e. B ) -> ( ( X .x. .1. ) = ( X .x. .0. ) <-> X = .0. ) )
19	18	biimpd 144	. . . . . . 7 |- ( ( R e. Ring /\ X e. B ) -> ( ( X .x. .1. ) = ( X .x. .0. ) -> X = .0. ) )
20	2, 14, 19	syl2anc 411	. . . . . 6 |- ( ph -> ( ( X .x. .1. ) = ( X .x. .0. ) -> X = .0. ) )
21	20	ad2antrr 488	. . . . 5 |- ( ( ( ph /\ a e. B ) /\ ( a .x. X ) = .1. ) -> ( ( X .x. .1. ) = ( X .x. .0. ) -> X = .0. ) )
22	13, 21	syl5 32	. . . 4 |- ( ( ( ph /\ a e. B ) /\ ( a .x. X ) = .1. ) -> ( .1. = .0. -> X = .0. ) )
23	12, 22	impbid 129	. . 3 |- ( ( ( ph /\ a e. B ) /\ ( a .x. X ) = .1. ) -> ( X = .0. <-> .1. = .0. ) )
24		ringinvnzdiv.a	. . 3 |- ( ph -> E. a e. B ( a .x. X ) = .1. )
25	23, 24	r19.29a 2618	. 2 |- ( ph -> ( X = .0. <-> .1. = .0. ) )
26	25	necon3bid 2386	1 |- ( ph -> ( X =/= .0. <-> .1. =/= .0. ) )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   = wceq 1353   e. wcel 2146   =/= wne 2345   E.wrex 2454   ` cfv 5208  (class class class)co 5865   Basecbs 12427   .rcmulr 12492   0gc0g 12625   1rcur 12935   Ringcrg 12972

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 614  ax-in2 615  ax-io 709  ax-5 1445  ax-7 1446  ax-gen 1447  ax-ie1 1491  ax-ie2 1492  ax-8 1502  ax-10 1503  ax-11 1504  ax-i12 1505  ax-bndl 1507  ax-4 1508  ax-17 1524  ax-i9 1528  ax-ial 1532  ax-i5r 1533  ax-13 2148  ax-14 2149  ax-ext 2157  ax-sep 4116  ax-pow 4169  ax-pr 4203  ax-un 4427  ax-setind 4530  ax-cnex 7877  ax-resscn 7878  ax-1cn 7879  ax-1re 7880  ax-icn 7881  ax-addcl 7882  ax-addrcl 7883  ax-mulcl 7884  ax-addcom 7886  ax-addass 7888  ax-i2m1 7891  ax-0lt1 7892  ax-0id 7894  ax-rnegex 7895  ax-pre-ltirr 7898  ax-pre-ltadd 7902

This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-fal 1359  df-nf 1459  df-sb 1761  df-eu 2027  df-mo 2028  df-clab 2162  df-cleq 2168  df-clel 2171  df-nfc 2306  df-ne 2346  df-nel 2441  df-ral 2458  df-rex 2459  df-reu 2460  df-rmo 2461  df-rab 2462  df-v 2737  df-sbc 2961  df-csb 3056  df-dif 3129  df-un 3131  df-in 3133  df-ss 3140  df-nul 3421  df-pw 3574  df-sn 3595  df-pr 3596  df-op 3598  df-uni 3806  df-int 3841  df-br 3999  df-opab 4060  df-mpt 4061  df-id 4287  df-xp 4626  df-rel 4627  df-cnv 4628  df-co 4629  df-dm 4630  df-rn 4631  df-res 4632  df-ima 4633  df-iota 5170  df-fun 5210  df-fn 5211  df-fv 5216  df-riota 5821  df-ov 5868  df-oprab 5869  df-mpo 5870  df-pnf 7968  df-mnf 7969  df-ltxr 7971  df-inn 8891  df-2 8949  df-3 8950  df-ndx 12430  df-slot 12431  df-base 12433  df-sets 12434  df-plusg 12504  df-mulr 12505  df-0g 12627  df-mgm 12639  df-sgrp 12672  df-mnd 12682  df-grp 12740  df-mgp 12926  df-ur 12936  df-ring 12974

This theorem is referenced by: (None)