Theorem grpassd 18830

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 18827	. 2 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → ((𝑋 + 𝑌) + 𝑍) = (𝑋 + (𝑌 + 𝑍)))
8	1, 2, 3, 4, 7	syl13anc 1372	1 ⊢ (𝜑 → ((𝑋 + 𝑌) + 𝑍) = (𝑋 + (𝑌 + 𝑍)))

Syntax hints:   → wi 4   = wceq 1541   ∈ wcel 2106  ‘cfv 6543  (class class class)co 7408  Basecbs 17143  +_gcplusg 17196  Grpcgrp 18818

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 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-ext 2703  ax-nul 5306

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-sb 2068  df-clab 2710  df-cleq 2724  df-clel 2810  df-ne 2941  df-ral 3062  df-rex 3071  df-rab 3433  df-v 3476  df-sbc 3778  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-nul 4323  df-if 4529  df-sn 4629  df-pr 4631  df-op 4635  df-uni 4909  df-br 5149  df-iota 6495  df-fv 6551  df-ov 7411  df-sgrp 18609  df-mnd 18625  df-grp 18821

This theorem is referenced by:  eqger  19057  qsdrngilem  32603  grpcominv1  41084