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Theorem gaset 19335
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 2764 . . . 4 (Base‘𝐺) = (Base‘𝐺)
2 eqid 2764 . . . 4 (+g𝐺) = (+g𝐺)
3 eqid 2764 . . . 4 (0g𝐺) = (0g𝐺)
41, 2, 3isga 19333 . . 3 ( ∈ (𝐺 GrpAct 𝑌) ↔ ((𝐺 ∈ Grp ∧ 𝑌 ∈ V) ∧ ( :((Base‘𝐺) × 𝑌)⟶𝑌 ∧ ∀𝑥𝑌 (((0g𝐺) 𝑥) = 𝑥 ∧ ∀𝑦 ∈ (Base‘𝐺)∀𝑧 ∈ (Base‘𝐺)((𝑦(+g𝐺)𝑧) 𝑥) = (𝑦 (𝑧 𝑥))))))
54simplbi 500 . 2 ( ∈ (𝐺 GrpAct 𝑌) → (𝐺 ∈ Grp ∧ 𝑌 ∈ V))
65simprd 499 1 ( ∈ (𝐺 GrpAct 𝑌) → 𝑌 ∈ V)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 399   = wceq 1562  wcel 2144  wral 3078  Vcvv 3456   × cxp 5647  wf 6519  cfv 6523  (class class class)co 7398  Basecbs 17247  +gcplusg 17288  0gc0g 17470  Grpcgrp 18977   GrpAct cga 19331
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1817  ax-4 1831  ax-5 1932  ax-6 1989  ax-7 2030  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2214  ax-ext 2736  ax-sep 5248  ax-nul 5258  ax-pow 5324  ax-pr 5392  ax-un 7720
This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1101  df-tru 1565  df-fal 1575  df-ex 1802  df-nf 1806  df-sb 2093  df-mo 2568  df-eu 2598  df-clab 2743  df-cleq 2756  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3079  df-rex 3089  df-rab 3417  df-v 3458  df-sbc 3747  df-csb 3855  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4288  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5103  df-opab 5165  df-id 5544  df-xp 5655  df-rel 5656  df-cnv 5657  df-co 5658  df-dm 5659  df-rn 5660  df-iota 6479  df-fun 6525  df-fn 6526  df-f 6527  df-fv 6531  df-ov 7401  df-oprab 7402  df-mpo 7403  df-map 8812  df-ga 19332
This theorem is referenced by:  gass  19343  gasubg  19344  galactghm  19446  fxpgaval  33349  fxpsubm  33354  fxpsubg  33355  fxpsubrg  33356  fxpsdrg  33357
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