Theorem grpassd 18963

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 18960	. 2 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → ((𝑋 + 𝑌) + 𝑍) = (𝑋 + (𝑌 + 𝑍)))
8	1, 2, 3, 4, 7	syl13anc 1374	1 ⊢ (𝜑 → ((𝑋 + 𝑌) + 𝑍) = (𝑋 + (𝑌 + 𝑍)))

Syntax hints:   → wi 4   = wceq 1540   ∈ wcel 2108  ‘cfv 6561  (class class class)co 7431  Basecbs 17247  +_gcplusg 17297  Grpcgrp 18951

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-ext 2708  ax-nul 5306

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1543  df-fal 1553  df-ex 1780  df-sb 2065  df-clab 2715  df-cleq 2729  df-clel 2816  df-ne 2941  df-ral 3062  df-rex 3071  df-rab 3437  df-v 3482  df-sbc 3789  df-dif 3954  df-un 3956  df-ss 3968  df-nul 4334  df-if 4526  df-sn 4627  df-pr 4629  df-op 4633  df-uni 4908  df-br 5144  df-iota 6514  df-fv 6569  df-ov 7434  df-sgrp 18732  df-mnd 18748  df-grp 18954

This theorem is referenced by:  grplmulf1o  19031  grpraddf1o  19032  eqger  19196  conjnmz  19270  psdmul  22170  rloccring  33274  qsdrngilem  33522  grpcominv1  42518