Theorem grpasscan1 19125

Description: An associative cancellation law for groups. (Contributed by Paul Chapman, 25-Feb-2008.) (Revised by AV, 30-Aug-2021.)

Hypotheses

Ref	Expression
grplcan.b	⊢ 𝐵 = (Base‘𝐺)
grplcan.p	⊢ + = (+g‘𝐺)
grpasscan1.n	⊢ 𝑁 = (invg‘𝐺)

Assertion

Ref	Expression
grpasscan1	⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 + ((𝑁‘𝑋) + 𝑌)) = 𝑌)

Proof of Theorem grpasscan1

Step	Hyp	Ref	Expression
1		grplcan.b	. . . . 5 ⊢ 𝐵 = (Base‘𝐺)
2		grplcan.p	. . . . 5 ⊢ + = (+g‘𝐺)
3		eqid 2760	. . . . 5 ⊢ (0g‘𝐺) = (0g‘𝐺)
4		grpasscan1.n	. . . . 5 ⊢ 𝑁 = (invg‘𝐺)
5	1, 2, 3, 4	grprinv 19114	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵) → (𝑋 + (𝑁‘𝑋)) = (0g‘𝐺))
6	5	3adant3 1150	. . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 + (𝑁‘𝑋)) = (0g‘𝐺))
7	6	oveq1d 7428	. 2 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ((𝑋 + (𝑁‘𝑋)) + 𝑌) = ((0g‘𝐺) + 𝑌))
8	1, 4	grpinvcl 19111	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵) → (𝑁‘𝑋) ∈ 𝐵)
9	1, 2	grpass 19066	. . . . . 6 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ (𝑁‘𝑋) ∈ 𝐵 ∧ 𝑌 ∈ 𝐵)) → ((𝑋 + (𝑁‘𝑋)) + 𝑌) = (𝑋 + ((𝑁‘𝑋) + 𝑌)))
10	9	3exp2 1373	. . . . 5 ⊢ (𝐺 ∈ Grp → (𝑋 ∈ 𝐵 → ((𝑁‘𝑋) ∈ 𝐵 → (𝑌 ∈ 𝐵 → ((𝑋 + (𝑁‘𝑋)) + 𝑌) = (𝑋 + ((𝑁‘𝑋) + 𝑌))))))
11	10	imp 412	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵) → ((𝑁‘𝑋) ∈ 𝐵 → (𝑌 ∈ 𝐵 → ((𝑋 + (𝑁‘𝑋)) + 𝑌) = (𝑋 + ((𝑁‘𝑋) + 𝑌)))))
12	8, 11	mpd 16	. . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵) → (𝑌 ∈ 𝐵 → ((𝑋 + (𝑁‘𝑋)) + 𝑌) = (𝑋 + ((𝑁‘𝑋) + 𝑌))))
13	12	3impia 1135	. 2 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ((𝑋 + (𝑁‘𝑋)) + 𝑌) = (𝑋 + ((𝑁‘𝑋) + 𝑌)))
14	1, 2, 3	grplid 19091	. . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝑌 ∈ 𝐵) → ((0g‘𝐺) + 𝑌) = 𝑌)
15	14	3adant2 1149	. 2 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ((0g‘𝐺) + 𝑌) = 𝑌)
16	7, 13, 15	3eqtr3d 2803	1 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 + ((𝑁‘𝑋) + 𝑌)) = 𝑌)

This proof depends on syntax axioms:   → wi 4   ∧ wa 401   ∧ w3a 1103   = wceq 1570   ∈ wcel 2145  ‘cfv 6533  (class class class)co 7413  Basecbs 17301  +_gcplusg 17342  0_gc0g 17524  Grpcgrp 19057  inv_gcminusg 19058

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2732  ax-sep 5251  ax-nul 5263  ax-pow 5330  ax-pr 5398  ax-un 7736

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-rmo 3365  df-reu 3366  df-rab 3413  df-v 3452  df-sbc 3740  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-opab 5168  df-mpt 5187  df-id 5550  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-res 5667  df-ima 5668  df-iota 6489  df-fun 6535  df-fn 6536  df-f 6537  df-fv 6541  df-riota 7370  df-ov 7416  df-0g 17526  df-mgm 18730  df-sgrp 18821  df-mnd 18837  df-grp 19060  df-minusg 19061

This theorem is used by:  mulgaddcomlem  19220  ghmqusnsglem1  19407  ghmquskerlem1  19410  grplsmid  33833  nsgqusf1olem3  33844  qsdrnglem2  33898