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Theorem gaset 19507
Description: The right argument of a group action is a set. (Contributed by Mario Carneiro, 30-Apr-2015.)
Assertion
Ref Expression
gaset ( ⊕ ∈ (𝐺 GrpAct 𝑌) → 𝑌 ∈ V)

Proof of Theorem gaset
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 eqid 2760 . . . 4 (Base‘𝐺) = (Base‘𝐺)
2 eqid 2760 . . . 4 (+g‘𝐺) = (+g‘𝐺)
3 eqid 2760 . . . 4 (0g‘𝐺) = (0g‘𝐺)
41, 2, 3isga 19505 . . 3 ( ⊕ ∈ (𝐺 GrpAct 𝑌) ↔ ((𝐺 ∈ Grp ∧ 𝑌 ∈ V) ∧ ( ⊕ :((Base‘𝐺) × 𝑌)⟶𝑌 ∧ ∀𝑥 ∈ 𝑌 (((0g‘𝐺) ⊕ 𝑥) = 𝑥 ∧ ∀𝑦 ∈ (Base‘𝐺)∀𝑧 ∈ (Base‘𝐺)((𝑦(+g‘𝐺)𝑧) ⊕ 𝑥) = (𝑦 ⊕ (𝑧 ⊕ 𝑥))))))
54simplbi 502 . 2 ( ⊕ ∈ (𝐺 GrpAct 𝑌) → (𝐺 ∈ Grp ∧ 𝑌 ∈ V))
65simprd 501 1 ( ⊕ ∈ (𝐺 GrpAct 𝑌) → 𝑌 ∈ V)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∧ wa 401   = wceq 1569   ∈ wcel 2144  ∀wral 3076  Vcvv 3450   × cxp 5648  ⟶wf 6534  ‘cfv 6538  (class class class)co 7420  Basecbs 17387  +gcplusg 17428  0gc0g 17610  Grpcgrp 19144   GrpAct cga 19503
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-sep 5248  ax-nul 5259  ax-pow 5326  ax-pr 5390  ax-un 7751
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-sbc 3739  df-csb 3847  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-pw 4558  df-sn 4584  df-pr 4586  df-op 4590  df-uni 4867  df-br 5103  df-opab 5167  df-id 5545  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-iota 6494  df-fun 6540  df-fn 6541  df-f 6542  df-fv 6546  df-ov 7423  df-oprab 7424  df-mpo 7425  df-map 8849  df-ga 19504
This theorem is used by:  gass  19515  gasubg  19516  galactghm  19618  fxpgaval  33728  fxpsubm  33733  fxpsubg  33734  fxpsubrg  33735  fxpsdrg  33736
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