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Theorem grpinvnzcl 18895

Description: The inverse of a nonzero group element is a nonzero group element. (Contributed by Stefan O'Rear, 27-Feb-2015.)

**Hypotheses**
Ref	Expression
grpinvnzcl.b	⊢ 𝐵 = (Base‘𝐺)
grpinvnzcl.z	⊢ 0 = (0_g‘𝐺)
grpinvnzcl.n	⊢ 𝑁 = (inv_g‘𝐺)

**Assertion**
Ref	Expression
grpinvnzcl	⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ (𝐵 ∖ { 0 })) → (𝑁‘𝑋) ∈ (𝐵 ∖ { 0 }))

**Proof of Theorem grpinvnzcl**
Step	Hyp	Ref	Expression
1		eldifi 4127	. . 3 ⊢ (𝑋 ∈ (𝐵 ∖ { 0 }) → 𝑋 ∈ 𝐵)
2		grpinvnzcl.b	. . . 4 ⊢ 𝐵 = (Base‘𝐺)
3		grpinvnzcl.n	. . . 4 ⊢ 𝑁 = (inv_g‘𝐺)
4	2, 3	grpinvcl 18872	. . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵) → (𝑁‘𝑋) ∈ 𝐵)
5	1, 4	sylan2 594	. 2 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ (𝐵 ∖ { 0 })) → (𝑁‘𝑋) ∈ 𝐵)
6		eldifsn 4791	. . 3 ⊢ (𝑋 ∈ (𝐵 ∖ { 0 }) ↔ (𝑋 ∈ 𝐵 ∧ 𝑋 ≠ 0 ))
7		grpinvnzcl.z	. . . . 5 ⊢ 0 = (0_g‘𝐺)
8	2, 7, 3	grpinvnz 18894	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑋 ≠ 0 ) → (𝑁‘𝑋) ≠ 0 )
9	8	3expb 1121	. . 3 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑋 ≠ 0 )) → (𝑁‘𝑋) ≠ 0 )
10	6, 9	sylan2b 595	. 2 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ (𝐵 ∖ { 0 })) → (𝑁‘𝑋) ≠ 0 )
11		eldifsn 4791	. 2 ⊢ ((𝑁‘𝑋) ∈ (𝐵 ∖ { 0 }) ↔ ((𝑁‘𝑋) ∈ 𝐵 ∧ (𝑁‘𝑋) ≠ 0 ))
12	5, 10, 11	sylanbrc 584	1 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ (𝐵 ∖ { 0 })) → (𝑁‘𝑋) ∈ (𝐵 ∖ { 0 }))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 397 = wceq 1542 ∈ wcel 2107 ≠ wne 2941 ∖ cdif 3946 {csn 4629 ‘cfv 6544 Basecbs 17144 0_gc0g 17385 Grpcgrp 18819 inv_gcminusg 18820

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-br 5150 df-opab 5212 df-mpt 5233 df-id 5575 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-fv 6552 df-riota 7365 df-ov 7412 df-0g 17387 df-mgm 18561 df-sgrp 18610 df-mnd 18626 df-grp 18822 df-minusg 18823

This theorem is referenced by: islindf4 21393 baerlem5amN 40587 baerlem5bmN 40588 baerlem5abmN 40589 lindslinindsimp1 47138 lindslinindsimp2lem5 47143

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