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Theorem grpassd 18919
Description: A group operation is associative. (Contributed by SN, 29-Jan-2025.)
Hypotheses
Ref Expression
grpassd.b 𝐵 = (Base‘𝐺)
grpassd.p + = (+g𝐺)
grpassd.g (𝜑𝐺 ∈ Grp)
grpassd.1 (𝜑𝑋𝐵)
grpassd.2 (𝜑𝑌𝐵)
grpassd.3 (𝜑𝑍𝐵)
Assertion
Ref Expression
grpassd (𝜑 → ((𝑋 + 𝑌) + 𝑍) = (𝑋 + (𝑌 + 𝑍)))

Proof of Theorem grpassd
StepHypRef Expression
1 grpassd.g . 2 (𝜑𝐺 ∈ Grp)
2 grpassd.1 . 2 (𝜑𝑋𝐵)
3 grpassd.2 . 2 (𝜑𝑌𝐵)
4 grpassd.3 . 2 (𝜑𝑍𝐵)
5 grpassd.b . . 3 𝐵 = (Base‘𝐺)
6 grpassd.p . . 3 + = (+g𝐺)
75, 6grpass 18916 . 2 ((𝐺 ∈ Grp ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 + 𝑌) + 𝑍) = (𝑋 + (𝑌 + 𝑍)))
81, 2, 3, 4, 7syl13anc 1380 1 (𝜑 → ((𝑋 + 𝑌) + 𝑍) = (𝑋 + (𝑌 + 𝑍)))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1547  wcel 2119  cfv 6492  (class class class)co 7363  Basecbs 17177  +gcplusg 17218  Grpcgrp 18907
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-ext 2712  ax-nul 5235
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-sb 2074  df-clab 2719  df-cleq 2732  df-clel 2815  df-ne 2936  df-ral 3055  df-rex 3065  df-rab 3393  df-v 3434  df-sbc 3731  df-dif 3893  df-un 3895  df-ss 3907  df-nul 4269  df-if 4462  df-sn 4563  df-pr 4565  df-op 4569  df-uni 4846  df-br 5080  df-iota 6448  df-fv 6500  df-ov 7366  df-sgrp 18685  df-mnd 18701  df-grp 18910
This theorem is referenced by:  grplmulf1o  18987  grpraddf1o  18988  eqger  19151  conjnmz  19225  psdmul  22161  conjga  33258  rloccring  33358  qsdrngilem  33584  vietalem  33770  grpcominv1  43005
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