grpinvnzcl - Metamath Proof Explorer

	Metamath Proof Explorer		< Previous Next > Nearby theorems
Mirrors > Home > MPE Home > Th. List > grpinvnzcl		Structured version Visualization version GIF version

Theorem grpinvnzcl 18953

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 4085	. . 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 18929	. . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵) → (𝑁‘𝑋) ∈ 𝐵)
5	1, 4	sylan2 594	. 2 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ (𝐵 ∖ { 0 })) → (𝑁‘𝑋) ∈ 𝐵)
6		eldifsn 4744	. . 3 ⊢ (𝑋 ∈ (𝐵 ∖ { 0 }) ↔ (𝑋 ∈ 𝐵 ∧ 𝑋 ≠ 0 ))
7		grpinvnzcl.z	. . . . 5 ⊢ 0 = (0_g‘𝐺)
8	2, 7, 3	grpinvnz 18952	. . . 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 4744	. 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 395 = wceq 1542 ∈ wcel 2114 ≠ wne 2933 ∖ cdif 3900 {csn 4582 ‘cfv 6500 Basecbs 17148 0_gc0g 17371 Grpcgrp 18875 inv_gcminusg 18876

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-rmo 3352 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-br 5101 df-opab 5163 df-mpt 5182 df-id 5527 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-fv 6508 df-riota 7325 df-ov 7371 df-0g 17373 df-mgm 18577 df-sgrp 18656 df-mnd 18672 df-grp 18878 df-minusg 18879

This theorem is referenced by: islindf4 21805 baerlem5amN 42086 baerlem5bmN 42087 baerlem5abmN 42088 lindslinindsimp1 48811 lindslinindsimp2lem5 48816

W3C validator