Theorem grpinvnz 12947

Description: The inverse of a nonzero group element is not zero. (Contributed by Stefan O'Rear, 27-Feb-2015.)

Hypotheses

Ref	Expression
grpinvnzcl.b	|- B = ( Base ` G )
grpinvnzcl.z	|- .0. = ( 0g ` G )
grpinvnzcl.n	|- N = ( invg ` G )

Assertion

Ref	Expression
grpinvnz	|- ( ( G e. Grp /\ X e. B /\ X =/= .0. ) -> ( N ` X ) =/= .0. )

Proof of Theorem grpinvnz

Step	Hyp	Ref	Expression
1		fveq2 5517	. . . . . 6 |- ( ( N ` X ) = .0. -> ( N ` ( N ` X ) ) = ( N ` .0. ) )
2	1	adantl 277	. . . . 5 |- ( ( ( G e. Grp /\ X e. B ) /\ ( N ` X ) = .0. ) -> ( N ` ( N ` X ) ) = ( N ` .0. ) )
3		grpinvnzcl.b	. . . . . . 7 |- B = ( Base ` G )
4		grpinvnzcl.n	. . . . . . 7 |- N = ( invg ` G )
5	3, 4	grpinvinv 12943	. . . . . 6 |- ( ( G e. Grp /\ X e. B ) -> ( N ` ( N ` X ) ) = X )
6	5	adantr 276	. . . . 5 |- ( ( ( G e. Grp /\ X e. B ) /\ ( N ` X ) = .0. ) -> ( N ` ( N ` X ) ) = X )
7		grpinvnzcl.z	. . . . . . 7 |- .0. = ( 0g ` G )
8	7, 4	grpinvid 12936	. . . . . 6 |- ( G e. Grp -> ( N ` .0. ) = .0. )
9	8	ad2antrr 488	. . . . 5 |- ( ( ( G e. Grp /\ X e. B ) /\ ( N ` X ) = .0. ) -> ( N ` .0. ) = .0. )
10	2, 6, 9	3eqtr3d 2218	. . . 4 |- ( ( ( G e. Grp /\ X e. B ) /\ ( N ` X ) = .0. ) -> X = .0. )
11	10	ex 115	. . 3 |- ( ( G e. Grp /\ X e. B ) -> ( ( N ` X ) = .0. -> X = .0. ) )
12	11	necon3d 2391	. 2 |- ( ( G e. Grp /\ X e. B ) -> ( X =/= .0. -> ( N ` X ) =/= .0. ) )
13	12	3impia 1200	1 |- ( ( G e. Grp /\ X e. B /\ X =/= .0. ) -> ( N ` X ) =/= .0. )

Syntax hints:   -> wi 4   /\ wa 104   /\ w3a 978   = wceq 1353   e. wcel 2148   =/= wne 2347   ` cfv 5218   Basecbs 12465   0gc0g 12711   Grpcgrp 12883   invgcminusg 12884

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 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-coll 4120  ax-sep 4123  ax-pow 4176  ax-pr 4211  ax-un 4435  ax-cnex 7905  ax-resscn 7906  ax-1re 7908  ax-addrcl 7911

This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ne 2348  df-ral 2460  df-rex 2461  df-reu 2462  df-rmo 2463  df-rab 2464  df-v 2741  df-sbc 2965  df-csb 3060  df-un 3135  df-in 3137  df-ss 3144  df-pw 3579  df-sn 3600  df-pr 3601  df-op 3603  df-uni 3812  df-int 3847  df-iun 3890  df-br 4006  df-opab 4067  df-mpt 4068  df-id 4295  df-xp 4634  df-rel 4635  df-cnv 4636  df-co 4637  df-dm 4638  df-rn 4639  df-res 4640  df-ima 4641  df-iota 5180  df-fun 5220  df-fn 5221  df-f 5222  df-f1 5223  df-fo 5224  df-f1o 5225  df-fv 5226  df-riota 5834  df-ov 5881  df-inn 8923  df-2 8981  df-ndx 12468  df-slot 12469  df-base 12471  df-plusg 12552  df-0g 12713  df-mgm 12781  df-sgrp 12814  df-mnd 12824  df-grp 12886  df-minusg 12887

This theorem is referenced by:  grpinvnzcl  12948