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Theorem grpcominv2 42968
Description: If two elements commute, then they commute with each other's inverses (case of the second element commuting with the inverse of the first element). (Contributed by SN, 1-Feb-2025.)
Hypotheses
Ref Expression
grpcominv.b 𝐵 = (Base‘𝐺)
grpcominv.p + = (+g𝐺)
grpcominv.n 𝑁 = (invg𝐺)
grpcominv.g (𝜑𝐺 ∈ Grp)
grpcominv.x (𝜑𝑋𝐵)
grpcominv.y (𝜑𝑌𝐵)
grpcominv.1 (𝜑 → (𝑋 + 𝑌) = (𝑌 + 𝑋))
Assertion
Ref Expression
grpcominv2 (𝜑 → (𝑌 + (𝑁𝑋)) = ((𝑁𝑋) + 𝑌))

Proof of Theorem grpcominv2
StepHypRef Expression
1 grpcominv.b . 2 𝐵 = (Base‘𝐺)
2 grpcominv.p . 2 + = (+g𝐺)
3 grpcominv.n . 2 𝑁 = (invg𝐺)
4 grpcominv.g . 2 (𝜑𝐺 ∈ Grp)
5 grpcominv.y . 2 (𝜑𝑌𝐵)
6 grpcominv.x . 2 (𝜑𝑋𝐵)
7 grpcominv.1 . . 3 (𝜑 → (𝑋 + 𝑌) = (𝑌 + 𝑋))
87eqcomd 2743 . 2 (𝜑 → (𝑌 + 𝑋) = (𝑋 + 𝑌))
91, 2, 3, 4, 5, 6, 8grpcominv1 42967 1 (𝜑 → (𝑌 + (𝑁𝑋)) = ((𝑁𝑋) + 𝑌))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1542  wcel 2114  cfv 6492  (class class class)co 7360  Basecbs 17170  +gcplusg 17211  Grpcgrp 18900  invgcminusg 18901
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 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-sep 5231  ax-nul 5241  ax-pow 5302  ax-pr 5370  ax-un 7682
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-rmo 3343  df-reu 3344  df-rab 3391  df-v 3432  df-sbc 3730  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4275  df-if 4468  df-pw 4544  df-sn 4569  df-pr 4571  df-op 4575  df-uni 4852  df-br 5087  df-opab 5149  df-mpt 5168  df-id 5519  df-xp 5630  df-rel 5631  df-cnv 5632  df-co 5633  df-dm 5634  df-rn 5635  df-res 5636  df-ima 5637  df-iota 6448  df-fun 6494  df-fn 6495  df-f 6496  df-fv 6500  df-riota 7317  df-ov 7363  df-0g 17395  df-mgm 18599  df-sgrp 18678  df-mnd 18694  df-grp 18903  df-minusg 18904
This theorem is referenced by: (None)
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