Theorem grpsubadd 19095

Description: Relationship between group subtraction and addition. (Contributed by NM, 31-Mar-2014.)

Hypotheses

Ref	Expression
grpsubadd.b	⊢ 𝐵 = (Base‘𝐺)
grpsubadd.p	⊢ + = (+g‘𝐺)
grpsubadd.m	⊢ − = (-g‘𝐺)

Assertion

Ref	Expression
grpsubadd	⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → ((𝑋 − 𝑌) = 𝑍 ↔ (𝑍 + 𝑌) = 𝑋))

Proof of Theorem grpsubadd

Step	Hyp	Ref	Expression
1		grpsubadd.b	. . . . . . 7 ⊢ 𝐵 = (Base‘𝐺)
2		grpsubadd.p	. . . . . . 7 ⊢ + = (+g‘𝐺)
3		eqid 2763	. . . . . . 7 ⊢ (invg‘𝐺) = (invg‘𝐺)
4		grpsubadd.m	. . . . . . 7 ⊢ − = (-g‘𝐺)
5	1, 2, 3, 4	grpsubval 19053	. . . . . 6 ⊢ ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 − 𝑌) = (𝑋 + ((invg‘𝐺)‘𝑌)))
6	5	3adant3 1150	. . . . 5 ⊢ ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵) → (𝑋 − 𝑌) = (𝑋 + ((invg‘𝐺)‘𝑌)))
7	6	adantl 486	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → (𝑋 − 𝑌) = (𝑋 + ((invg‘𝐺)‘𝑌)))
8	7	eqeq1d 2765	. . 3 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → ((𝑋 − 𝑌) = 𝑍 ↔ (𝑋 + ((invg‘𝐺)‘𝑌)) = 𝑍))
9		simpl 487	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → 𝐺 ∈ Grp)
10		simpr1 1213	. . . . 5 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → 𝑋 ∈ 𝐵)
11	1, 3	grpinvcl 19055	. . . . . 6 ⊢ ((𝐺 ∈ Grp ∧ 𝑌 ∈ 𝐵) → ((invg‘𝐺)‘𝑌) ∈ 𝐵)
12	11	3ad2antr2 1208	. . . . 5 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → ((invg‘𝐺)‘𝑌) ∈ 𝐵)
13	1, 2	grpcl 19009	. . . . 5 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ ((invg‘𝐺)‘𝑌) ∈ 𝐵) → (𝑋 + ((invg‘𝐺)‘𝑌)) ∈ 𝐵)
14	9, 10, 12, 13	syl3anc 1398	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → (𝑋 + ((invg‘𝐺)‘𝑌)) ∈ 𝐵)
15		simpr3 1215	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → 𝑍 ∈ 𝐵)
16		simpr2 1214	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → 𝑌 ∈ 𝐵)
17	1, 2	grprcan 19041	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ ((𝑋 + ((invg‘𝐺)‘𝑌)) ∈ 𝐵 ∧ 𝑍 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵)) → (((𝑋 + ((invg‘𝐺)‘𝑌)) + 𝑌) = (𝑍 + 𝑌) ↔ (𝑋 + ((invg‘𝐺)‘𝑌)) = 𝑍))
18	9, 14, 15, 16, 17	syl13anc 1399	. . 3 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → (((𝑋 + ((invg‘𝐺)‘𝑌)) + 𝑌) = (𝑍 + 𝑌) ↔ (𝑋 + ((invg‘𝐺)‘𝑌)) = 𝑍))
19	1, 2	grpass 19010	. . . . . 6 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ ((invg‘𝐺)‘𝑌) ∈ 𝐵 ∧ 𝑌 ∈ 𝐵)) → ((𝑋 + ((invg‘𝐺)‘𝑌)) + 𝑌) = (𝑋 + (((invg‘𝐺)‘𝑌) + 𝑌)))
20	9, 10, 12, 16, 19	syl13anc 1399	. . . . 5 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → ((𝑋 + ((invg‘𝐺)‘𝑌)) + 𝑌) = (𝑋 + (((invg‘𝐺)‘𝑌) + 𝑌)))
21		eqid 2763	. . . . . . . 8 ⊢ (0g‘𝐺) = (0g‘𝐺)
22	1, 2, 21, 3	grplinv 19057	. . . . . . 7 ⊢ ((𝐺 ∈ Grp ∧ 𝑌 ∈ 𝐵) → (((invg‘𝐺)‘𝑌) + 𝑌) = (0g‘𝐺))
23	22	3ad2antr2 1208	. . . . . 6 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → (((invg‘𝐺)‘𝑌) + 𝑌) = (0g‘𝐺))
24	23	oveq2d 7428	. . . . 5 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → (𝑋 + (((invg‘𝐺)‘𝑌) + 𝑌)) = (𝑋 + (0g‘𝐺)))
25	1, 2, 21	grprid 19036	. . . . . 6 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵) → (𝑋 + (0g‘𝐺)) = 𝑋)
26	25	3ad2antr1 1207	. . . . 5 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → (𝑋 + (0g‘𝐺)) = 𝑋)
27	20, 24, 26	3eqtrd 2802	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → ((𝑋 + ((invg‘𝐺)‘𝑌)) + 𝑌) = 𝑋)
28	27	eqeq1d 2765	. . 3 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → (((𝑋 + ((invg‘𝐺)‘𝑌)) + 𝑌) = (𝑍 + 𝑌) ↔ 𝑋 = (𝑍 + 𝑌)))
29	8, 18, 28	3bitr2d 310	. 2 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → ((𝑋 − 𝑌) = 𝑍 ↔ 𝑋 = (𝑍 + 𝑌)))
30		eqcom 2770	. 2 ⊢ (𝑋 = (𝑍 + 𝑌) ↔ (𝑍 + 𝑌) = 𝑋)
31	29, 30	bitrdi 290	1 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → ((𝑋 − 𝑌) = 𝑍 ↔ (𝑍 + 𝑌) = 𝑋))

Syntax hints:   → wi 4   ↔ wb 209   ∧ wa 400   ∧ w3a 1103   = wceq 1570   ∈ wcel 2143  ‘cfv 6538  (class class class)co 7412  Basecbs 17270  +_gcplusg 17311  0_gc0g 17493  Grpcgrp 19001  inv_gcminusg 19002  -_gcsg 19003

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-sep 5258  ax-nul 5270  ax-pow 5338  ax-pr 5406  ax-un 7734

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-ral 3080  df-rex 3090  df-rmo 3369  df-reu 3370  df-rab 3417  df-v 3457  df-sbc 3746  df-csb 3855  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4288  df-if 4489  df-pw 4565  df-sn 4591  df-pr 4593  df-op 4597  df-uni 4874  df-iun 4959  df-br 5111  df-opab 5175  df-mpt 5194  df-id 5558  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-rn 5674  df-res 5675  df-ima 5676  df-iota 6494  df-fun 6540  df-fn 6541  df-f 6542  df-fv 6546  df-riota 7369  df-ov 7415  df-oprab 7416  df-mpo 7417  df-1st 7987  df-2nd 7988  df-0g 17495  df-mgm 18699  df-sgrp 18778  df-mnd 18794  df-grp 19004  df-minusg 19005  df-sbg 19006

This theorem is referenced by:  grpsubsub4  19100  xpsgrpsub  19128  conjghm  19320  conjnmzb  19324  sylow3lem2  19699  ablsubadd  19880  ablsubsub23  19895  pgpfac1lem2  20148  pgpfac1lem4  20151  lspexch  21234  ipsubdir  21773  ipsubdi  21774  coe1subfv  22408  dflring2  33761  lindsunlem  33992  zlmodzxzsub  49117