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Theorem grpinvnzcl 18926

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 4080	. . 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 18902	. . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵) → (𝑁‘𝑋) ∈ 𝐵)
5	1, 4	sylan2 593	. 2 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ (𝐵 ∖ { 0 })) → (𝑁‘𝑋) ∈ 𝐵)
6		eldifsn 4737	. . 3 ⊢ (𝑋 ∈ (𝐵 ∖ { 0 }) ↔ (𝑋 ∈ 𝐵 ∧ 𝑋 ≠ 0 ))
7		grpinvnzcl.z	. . . . 5 ⊢ 0 = (0_g‘𝐺)
8	2, 7, 3	grpinvnz 18925	. . . 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 4737	. 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 2113 ≠ wne 2929 ∖ cdif 3895 {csn 4575 ‘cfv 6486 Basecbs 17122 0_gc0g 17345 Grpcgrp 18848 inv_gcminusg 18849

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 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2182 ax-ext 2705 ax-sep 5236 ax-nul 5246 ax-pow 5305 ax-pr 5372 ax-un 7674

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 2537 df-eu 2566 df-clab 2712 df-cleq 2725 df-clel 2808 df-nfc 2882 df-ne 2930 df-ral 3049 df-rex 3058 df-rmo 3347 df-reu 3348 df-rab 3397 df-v 3439 df-sbc 3738 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-nul 4283 df-if 4475 df-pw 4551 df-sn 4576 df-pr 4578 df-op 4582 df-uni 4859 df-br 5094 df-opab 5156 df-mpt 5175 df-id 5514 df-xp 5625 df-rel 5626 df-cnv 5627 df-co 5628 df-dm 5629 df-rn 5630 df-res 5631 df-ima 5632 df-iota 6442 df-fun 6488 df-fn 6489 df-f 6490 df-fv 6494 df-riota 7309 df-ov 7355 df-0g 17347 df-mgm 18550 df-sgrp 18629 df-mnd 18645 df-grp 18851 df-minusg 18852

This theorem is referenced by: islindf4 21777 baerlem5amN 41836 baerlem5bmN 41837 baerlem5abmN 41838 lindslinindsimp1 48583 lindslinindsimp2lem5 48588

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