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Theorem grpinvnzcl 18921

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 4081	. . 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 18897	. . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵) → (𝑁‘𝑋) ∈ 𝐵)
5	1, 4	sylan2 593	. 2 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ (𝐵 ∖ { 0 })) → (𝑁‘𝑋) ∈ 𝐵)
6		eldifsn 4738	. . 3 ⊢ (𝑋 ∈ (𝐵 ∖ { 0 }) ↔ (𝑋 ∈ 𝐵 ∧ 𝑋 ≠ 0 ))
7		grpinvnzcl.z	. . . . 5 ⊢ 0 = (0_g‘𝐺)
8	2, 7, 3	grpinvnz 18920	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑋 ≠ 0 ) → (𝑁‘𝑋) ≠ 0 )
9	8	3expb 1120	. . 3 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑋 ≠ 0 )) → (𝑁‘𝑋) ≠ 0 )
10	6, 9	sylan2b 594	. 2 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ (𝐵 ∖ { 0 })) → (𝑁‘𝑋) ≠ 0 )
11		eldifsn 4738	. 2 ⊢ ((𝑁‘𝑋) ∈ (𝐵 ∖ { 0 }) ↔ ((𝑁‘𝑋) ∈ 𝐵 ∧ (𝑁‘𝑋) ≠ 0 ))
12	5, 10, 11	sylanbrc 583	1 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ (𝐵 ∖ { 0 })) → (𝑁‘𝑋) ∈ (𝐵 ∖ { 0 }))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1541 ∈ wcel 2111 ≠ wne 2928 ∖ cdif 3899 {csn 4576 ‘cfv 6481 Basecbs 17117 0_gc0g 17340 Grpcgrp 18843 inv_gcminusg 18844

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-sep 5234 ax-nul 5244 ax-pow 5303 ax-pr 5370 ax-un 7668

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-ral 3048 df-rex 3057 df-rmo 3346 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3742 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4284 df-if 4476 df-pw 4552 df-sn 4577 df-pr 4579 df-op 4583 df-uni 4860 df-br 5092 df-opab 5154 df-mpt 5173 df-id 5511 df-xp 5622 df-rel 5623 df-cnv 5624 df-co 5625 df-dm 5626 df-rn 5627 df-res 5628 df-ima 5629 df-iota 6437 df-fun 6483 df-fn 6484 df-f 6485 df-fv 6489 df-riota 7303 df-ov 7349 df-0g 17342 df-mgm 18545 df-sgrp 18624 df-mnd 18640 df-grp 18846 df-minusg 18847

This theorem is referenced by: islindf4 21773 baerlem5amN 41754 baerlem5bmN 41755 baerlem5abmN 41756 lindslinindsimp1 48488 lindslinindsimp2lem5 48493

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