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Theorem feq123d 6589
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 6588 . 2 (𝜑 → (𝐹:𝐴𝐶𝐺:𝐵𝐶))
4 feq123d.3 . . 3 (𝜑𝐶 = 𝐷)
54feq3d 6587 . 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 6429
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-ext 2709
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-sb 2068  df-clab 2716  df-cleq 2730  df-clel 2816  df-rab 3073  df-v 3434  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-nul 4257  df-if 4460  df-sn 4562  df-pr 4564  df-op 4568  df-br 5075  df-opab 5137  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-rn 5600  df-fun 6435  df-fn 6436  df-f 6437
This theorem is referenced by:  feq123  6590  feq23d  6595  fprg  7027  csbwrdg  14247  funcestrcsetclem8  17864  funcsetcestrclem8  17879  funcsetcestrclem9  17880  evlfcl  17940  yonedalem3a  17992  yonedalem4c  17995  yonedalem3b  17997  yonedainv  17999  iscau  24440  isuhgr  27430  uhgreq12g  27435  isuhgrop  27440  uhgrun  27444  isupgr  27454  upgrop  27464  isumgr  27465  upgrun  27488  umgrun  27490  lfuhgr1v0e  27621  wlkp1  28049  sseqf  32359  ismfs  33511  isrngo  36055  gneispace2  41742  funcringcsetcALTV2lem8  45601  funcringcsetclem8ALTV  45624
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