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Theorem fvmptg 5275
Description: Value of a function given in maps-to notation. (Contributed by NM, 2-Oct-2007.) (Revised by Mario Carneiro, 31-Aug-2015.)
Hypotheses
Ref Expression
fvmptg.1 (𝑥 = 𝐴𝐵 = 𝐶)
fvmptg.2 𝐹 = (𝑥𝐷𝐵)
Assertion
Ref Expression
fvmptg ((𝐴𝐷𝐶𝑅) → (𝐹𝐴) = 𝐶)
Distinct variable groups:   𝑥,𝐴   𝑥,𝐶   𝑥,𝐷
Allowed substitution hints:   𝐵(𝑥)   𝑅(𝑥)   𝐹(𝑥)

Proof of Theorem fvmptg
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 eqid 2056 . 2 𝐶 = 𝐶
2 fvmptg.1 . . . 4 (𝑥 = 𝐴𝐵 = 𝐶)
32eqeq2d 2067 . . 3 (𝑥 = 𝐴 → (𝑦 = 𝐵𝑦 = 𝐶))
4 eqeq1 2062 . . 3 (𝑦 = 𝐶 → (𝑦 = 𝐶𝐶 = 𝐶))
5 moeq 2738 . . . 4 ∃*𝑦 𝑦 = 𝐵
65a1i 9 . . 3 (𝑥𝐷 → ∃*𝑦 𝑦 = 𝐵)
7 fvmptg.2 . . . 4 𝐹 = (𝑥𝐷𝐵)
8 df-mpt 3847 . . . 4 (𝑥𝐷𝐵) = {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐷𝑦 = 𝐵)}
97, 8eqtri 2076 . . 3 𝐹 = {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐷𝑦 = 𝐵)}
103, 4, 6, 9fvopab3ig 5273 . 2 ((𝐴𝐷𝐶𝑅) → (𝐶 = 𝐶 → (𝐹𝐴) = 𝐶))
111, 10mpi 15 1 ((𝐴𝐷𝐶𝑅) → (𝐹𝐴) = 𝐶)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 101   = wceq 1259  wcel 1409  ∃*wmo 1917  {copab 3844  cmpt 3845  cfv 4929
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 103  ax-ia2 104  ax-ia3 105  ax-io 640  ax-5 1352  ax-7 1353  ax-gen 1354  ax-ie1 1398  ax-ie2 1399  ax-8 1411  ax-10 1412  ax-11 1413  ax-i12 1414  ax-bndl 1415  ax-4 1416  ax-14 1421  ax-17 1435  ax-i9 1439  ax-ial 1443  ax-i5r 1444  ax-ext 2038  ax-sep 3902  ax-pow 3954  ax-pr 3971
This theorem depends on definitions:  df-bi 114  df-3an 898  df-tru 1262  df-nf 1366  df-sb 1662  df-eu 1919  df-mo 1920  df-clab 2043  df-cleq 2049  df-clel 2052  df-nfc 2183  df-ral 2328  df-rex 2329  df-v 2576  df-sbc 2787  df-un 2949  df-in 2951  df-ss 2958  df-pw 3388  df-sn 3408  df-pr 3409  df-op 3411  df-uni 3608  df-br 3792  df-opab 3846  df-mpt 3847  df-id 4057  df-xp 4378  df-rel 4379  df-cnv 4380  df-co 4381  df-dm 4382  df-iota 4894  df-fun 4931  df-fv 4937
This theorem is referenced by:  fvmpt  5276  fvmpts  5277  fvmpt3  5278  fvmpt2  5281  f1mpt  5437  fnofval  5748  caofinvl  5760  1stvalg  5796  2ndvalg  5797  brtpos2  5896  frec0g  6013  frecsuclem3  6020  sucinc  6055  sucinc2  6056  omcl  6071  oeicl  6072  oav2  6073  omv2  6075  cardval3ex  6422  ceilqval  9250  monoord2  9394  iseqdistr  9408  serile  9412  cjval  9666  reval  9670  imval  9671  cvg1nlemcau  9804  cvg1nlemres  9805  absval  9820  resqrexlemglsq  9841  resqrexlemga  9842  climmpt  10044  climle  10077  climcvg1nlem  10091
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