ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  funssfv GIF version

Theorem funssfv 5665
Description: The value of a member of the domain of a subclass of a function. (Contributed by NM, 15-Aug-1994.)
Assertion
Ref Expression
funssfv ((Fun 𝐹𝐺𝐹𝐴 ∈ dom 𝐺) → (𝐹𝐴) = (𝐺𝐴))

Proof of Theorem funssfv
StepHypRef Expression
1 fvres 5663 . . . 4 (𝐴 ∈ dom 𝐺 → ((𝐹 ↾ dom 𝐺)‘𝐴) = (𝐹𝐴))
21eqcomd 2237 . . 3 (𝐴 ∈ dom 𝐺 → (𝐹𝐴) = ((𝐹 ↾ dom 𝐺)‘𝐴))
3 funssres 5369 . . . 4 ((Fun 𝐹𝐺𝐹) → (𝐹 ↾ dom 𝐺) = 𝐺)
43fveq1d 5641 . . 3 ((Fun 𝐹𝐺𝐹) → ((𝐹 ↾ dom 𝐺)‘𝐴) = (𝐺𝐴))
52, 4sylan9eqr 2286 . 2 (((Fun 𝐹𝐺𝐹) ∧ 𝐴 ∈ dom 𝐺) → (𝐹𝐴) = (𝐺𝐴))
653impa 1220 1 ((Fun 𝐹𝐺𝐹𝐴 ∈ dom 𝐺) → (𝐹𝐴) = (𝐺𝐴))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  w3a 1004   = wceq 1397  wcel 2202  wss 3200  dom cdm 4725  cres 4727  Fun wfun 5320  cfv 5326
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-v 2804  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-res 4737  df-iota 5286  df-fun 5328  df-fv 5334
This theorem is referenced by:  tfrlem9  6484  tfrlemiubacc  6495  tfr1onlemubacc  6511  tfrcllemubacc  6524  ac6sfi  7086  ennnfonelemex  13034  subgruhgredgdm  16120  subumgredg2en  16121  subupgr  16123
  Copyright terms: Public domain W3C validator