Theorem grpassd 18872

Description: A group operation is associative. (Contributed by SN, 29-Jan-2025.)

Hypotheses

Ref	Expression
grpassd.b	⊢ 𝐵 = (Base‘𝐺)
grpassd.p	⊢ + = (+g‘𝐺)
grpassd.g	⊢ (𝜑 → 𝐺 ∈ Grp)
grpassd.1	⊢ (𝜑 → 𝑋 ∈ 𝐵)
grpassd.2	⊢ (𝜑 → 𝑌 ∈ 𝐵)
grpassd.3	⊢ (𝜑 → 𝑍 ∈ 𝐵)

Assertion

Ref	Expression
grpassd	⊢ (𝜑 → ((𝑋 + 𝑌) + 𝑍) = (𝑋 + (𝑌 + 𝑍)))

Proof of Theorem grpassd

Step	Hyp	Ref	Expression
1		grpassd.g	. 2 ⊢ (𝜑 → 𝐺 ∈ Grp)
2		grpassd.1	. 2 ⊢ (𝜑 → 𝑋 ∈ 𝐵)
3		grpassd.2	. 2 ⊢ (𝜑 → 𝑌 ∈ 𝐵)
4		grpassd.3	. 2 ⊢ (𝜑 → 𝑍 ∈ 𝐵)
5		grpassd.b	. . 3 ⊢ 𝐵 = (Base‘𝐺)
6		grpassd.p	. . 3 ⊢ + = (+g‘𝐺)
7	5, 6	grpass 18869	. 2 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → ((𝑋 + 𝑌) + 𝑍) = (𝑋 + (𝑌 + 𝑍)))
8	1, 2, 3, 4, 7	syl13anc 1369	1 ⊢ (𝜑 → ((𝑋 + 𝑌) + 𝑍) = (𝑋 + (𝑌 + 𝑍)))

Syntax hints:   → wi 4   = wceq 1533   ∈ wcel 2098  ‘cfv 6536  (class class class)co 7404  Basecbs 17150  +_gcplusg 17203  Grpcgrp 18860

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-ext 2697  ax-nul 5299

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-sb 2060  df-clab 2704  df-cleq 2718  df-clel 2804  df-ne 2935  df-ral 3056  df-rex 3065  df-rab 3427  df-v 3470  df-sbc 3773  df-dif 3946  df-un 3948  df-in 3950  df-ss 3960  df-nul 4318  df-if 4524  df-sn 4624  df-pr 4626  df-op 4630  df-uni 4903  df-br 5142  df-iota 6488  df-fv 6544  df-ov 7407  df-sgrp 18649  df-mnd 18665  df-grp 18863

This theorem is referenced by:  eqger  19102  qsdrngilem  33113  grpcominv1  41625