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Theorem grpassd 19136
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
StepHypRef 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)
75, 6grpass 19133 . 2 ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → ((𝑋 + 𝑌) + 𝑍) = (𝑋 + (𝑌 + 𝑍)))
81, 2, 3, 4, 7syl13anc 1399 1 (𝜑 → ((𝑋 + 𝑌) + 𝑍) = (𝑋 + (𝑌 + 𝑍)))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1570   ∈ wcel 2145  ‘cfv 6531  (class class class)co 7412  Basecbs 17367  +gcplusg 17408  Grpcgrp 19124
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-ext 2733  ax-nul 5260
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-sb 2100  df-clab 2740  df-cleq 2753  df-clel 2836  df-ne 2957  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-sbc 3740  df-dif 3902  df-un 3904  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-iota 6487  df-fv 6539  df-ov 7415  df-sgrp 18888  df-mnd 18904  df-grp 19127
This theorem is used by:  grplmulf1o  19203  grpraddf1o  19204  eqger  19370  conjnmz  19446  psdmul  22467  conjga  33713  rloccring  33814  qsdrngilem  34000  vietalem  34193  grpcominv1  43540
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