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Theorem ablnnncan 19776

Description: Cancellation law for group subtraction. (nnncan 11525 analog.) (Contributed by NM, 29-Feb-2008.) (Revised by AV, 27-Aug-2021.)

**Hypotheses**
Ref	Expression
ablnncan.b	⊢ 𝐵 = (Base‘𝐺)
ablnncan.m	⊢ − = (-_g‘𝐺)
ablnncan.g	⊢ (𝜑 → 𝐺 ∈ Abel)
ablnncan.x	⊢ (𝜑 → 𝑋 ∈ 𝐵)
ablnncan.y	⊢ (𝜑 → 𝑌 ∈ 𝐵)
ablsub32.z	⊢ (𝜑 → 𝑍 ∈ 𝐵)

**Assertion**
Ref	Expression
ablnnncan	⊢ (𝜑 → ((𝑋 − (𝑌 − 𝑍)) − 𝑍) = (𝑋 − 𝑌))

**Proof of Theorem ablnnncan**
Step	Hyp	Ref	Expression
1		ablnncan.b	. . 3 ⊢ 𝐵 = (Base‘𝐺)
2		eqid 2728	. . 3 ⊢ (+_g‘𝐺) = (+_g‘𝐺)
3		ablnncan.m	. . 3 ⊢ − = (-_g‘𝐺)
4		ablnncan.g	. . 3 ⊢ (𝜑 → 𝐺 ∈ Abel)
5		ablnncan.x	. . 3 ⊢ (𝜑 → 𝑋 ∈ 𝐵)
6		ablgrp 19739	. . . . 5 ⊢ (𝐺 ∈ Abel → 𝐺 ∈ Grp)
7	4, 6	syl 17	. . . 4 ⊢ (𝜑 → 𝐺 ∈ Grp)
8		ablnncan.y	. . . 4 ⊢ (𝜑 → 𝑌 ∈ 𝐵)
9		ablsub32.z	. . . 4 ⊢ (𝜑 → 𝑍 ∈ 𝐵)
10	1, 3	grpsubcl 18975	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵) → (𝑌 − 𝑍) ∈ 𝐵)
11	7, 8, 9, 10	syl3anc 1369	. . 3 ⊢ (𝜑 → (𝑌 − 𝑍) ∈ 𝐵)
12	1, 2, 3, 4, 5, 11, 9	ablsubsub4 19772	. 2 ⊢ (𝜑 → ((𝑋 − (𝑌 − 𝑍)) − 𝑍) = (𝑋 − ((𝑌 − 𝑍)(+_g‘𝐺)𝑍)))
13	1, 2	ablcom 19753	. . . . 5 ⊢ ((𝐺 ∈ Abel ∧ (𝑌 − 𝑍) ∈ 𝐵 ∧ 𝑍 ∈ 𝐵) → ((𝑌 − 𝑍)(+_g‘𝐺)𝑍) = (𝑍(+_g‘𝐺)(𝑌 − 𝑍)))
14	4, 11, 9, 13	syl3anc 1369	. . . 4 ⊢ (𝜑 → ((𝑌 − 𝑍)(+_g‘𝐺)𝑍) = (𝑍(+_g‘𝐺)(𝑌 − 𝑍)))
15	1, 2, 3	ablpncan3 19770	. . . . 5 ⊢ ((𝐺 ∈ Abel ∧ (𝑍 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵)) → (𝑍(+_g‘𝐺)(𝑌 − 𝑍)) = 𝑌)
16	4, 9, 8, 15	syl12anc 836	. . . 4 ⊢ (𝜑 → (𝑍(+_g‘𝐺)(𝑌 − 𝑍)) = 𝑌)
17	14, 16	eqtrd 2768	. . 3 ⊢ (𝜑 → ((𝑌 − 𝑍)(+_g‘𝐺)𝑍) = 𝑌)
18	17	oveq2d 7436	. 2 ⊢ (𝜑 → (𝑋 − ((𝑌 − 𝑍)(+_g‘𝐺)𝑍)) = (𝑋 − 𝑌))
19	12, 18	eqtrd 2768	1 ⊢ (𝜑 → ((𝑋 − (𝑌 − 𝑍)) − 𝑍) = (𝑋 − 𝑌))

Colors of variables: wff setvar class

Syntax hints: → wi 4 = wceq 1534 ∈ wcel 2099 ‘cfv 6548 (class class class)co 7420 Basecbs 17179 +_gcplusg 17232 Grpcgrp 18889 -_gcsg 18891 Abelcabl 19735

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-sep 5299 ax-nul 5306 ax-pow 5365 ax-pr 5429 ax-un 7740

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-ral 3059 df-rex 3068 df-rmo 3373 df-reu 3374 df-rab 3430 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5576 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-iota 6500 df-fun 6550 df-fn 6551 df-f 6552 df-fv 6556 df-riota 7376 df-ov 7423 df-oprab 7424 df-mpo 7425 df-1st 7993 df-2nd 7994 df-0g 17422 df-mgm 18599 df-sgrp 18678 df-mnd 18694 df-grp 18892 df-minusg 18893 df-sbg 18894 df-cmn 19736 df-abl 19737

This theorem is referenced by: (None)

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