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Theorem feq123d 6573
Description: Equality deduction for functions. (Contributed by Paul Chapman, 22-Jun-2011.)
Hypotheses
Ref Expression
feq12d.1 (𝜑𝐹 = 𝐺)
feq12d.2 (𝜑𝐴 = 𝐵)
feq123d.3 (𝜑𝐶 = 𝐷)
Assertion
Ref Expression
feq123d (𝜑 → (𝐹:𝐴𝐶𝐺:𝐵𝐷))

Proof of Theorem feq123d
StepHypRef Expression
1 feq12d.1 . . 3 (𝜑𝐹 = 𝐺)
2 feq12d.2 . . 3 (𝜑𝐴 = 𝐵)
31, 2feq12d 6572 . 2 (𝜑 → (𝐹:𝐴𝐶𝐺:𝐵𝐶))
4 feq123d.3 . . 3 (𝜑𝐶 = 𝐷)
54feq3d 6571 . 2 (𝜑 → (𝐺:𝐵𝐶𝐺:𝐵𝐷))
63, 5bitrd 278 1 (𝜑 → (𝐹:𝐴𝐶𝐺:𝐵𝐷))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205   = wceq 1539  wf 6414
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-ext 2709
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-sb 2069  df-clab 2716  df-cleq 2730  df-clel 2817  df-rab 3072  df-v 3424  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4254  df-if 4457  df-sn 4559  df-pr 4561  df-op 4565  df-br 5071  df-opab 5133  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-fun 6420  df-fn 6421  df-f 6422
This theorem is referenced by:  feq123  6574  feq23d  6579  fprg  7009  csbwrdg  14175  funcestrcsetclem8  17780  funcsetcestrclem8  17795  funcsetcestrclem9  17796  evlfcl  17856  yonedalem3a  17908  yonedalem4c  17911  yonedalem3b  17913  yonedainv  17915  iscau  24345  isuhgr  27333  uhgreq12g  27338  isuhgrop  27343  uhgrun  27347  isupgr  27357  upgrop  27367  isumgr  27368  upgrun  27391  umgrun  27393  lfuhgr1v0e  27524  wlkp1  27951  sseqf  32259  ismfs  33411  isrngo  35982  gneispace2  41631  funcringcsetcALTV2lem8  45489  funcringcsetclem8ALTV  45512
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