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Theorem fvmpt2 5763
Description: Value of a function given by the maps-to notation. (Contributed by FL, 21-Jun-2010.)
Hypothesis
Ref Expression
fvmpt2.1 𝐹 = (𝑥𝐴𝐵)
Assertion
Ref Expression
fvmpt2 ((𝑥𝐴𝐵𝐶) → (𝐹𝑥) = 𝐵)
Distinct variable group:   𝑥,𝐴
Allowed substitution hints:   𝐵(𝑥)   𝐶(𝑥)   𝐹(𝑥)

Proof of Theorem fvmpt2
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 csbeq1 3143 . . 3 (𝑦 = 𝑥𝑦 / 𝑥𝐵 = 𝑥 / 𝑥𝐵)
2 csbid 3148 . . 3 𝑥 / 𝑥𝐵 = 𝐵
31, 2eqtrdi 2283 . 2 (𝑦 = 𝑥𝑦 / 𝑥𝐵 = 𝐵)
4 fvmpt2.1 . . 3 𝐹 = (𝑥𝐴𝐵)
5 nfcv 2386 . . . 4 𝑦𝐵
6 nfcsb1v 3173 . . . 4 𝑥𝑦 / 𝑥𝐵
7 csbeq1a 3149 . . . 4 (𝑥 = 𝑦𝐵 = 𝑦 / 𝑥𝐵)
85, 6, 7cbvmpt 4207 . . 3 (𝑥𝐴𝐵) = (𝑦𝐴𝑦 / 𝑥𝐵)
94, 8eqtri 2255 . 2 𝐹 = (𝑦𝐴𝑦 / 𝑥𝐵)
103, 9fvmptg 5755 1 ((𝑥𝐴𝐵𝐶) → (𝐹𝑥) = 𝐵)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104   = wceq 1398  wcel 2205  csb 3140  cmpt 4173  cfv 5354
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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2208  ax-ext 2216  ax-sep 4230  ax-pow 4289  ax-pr 4324
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-v 2817  df-sbc 3045  df-csb 3141  df-un 3217  df-in 3219  df-ss 3226  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-br 4112  df-opab 4174  df-mpt 4175  df-id 4416  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-dm 4761  df-iota 5314  df-fun 5356  df-fv 5362
This theorem is referenced by:  fvmptssdm  5764  fvmpt2d  5766  fvmptdf  5767  mpteqb  5770  fvmptt  5771  fvmptf  5772  fnmptfvd  5784  ralrnmpt  5821  rexrnmpt  5822  fmptco  5845  f1mpt  5946  offval2  6284  ofrfval2  6285  mptelixpg  6971  dom2lem  7013  mapxpen  7103  xpmapenlem  7104  mkvprop  7451  cc2lem  7585  cc3  7587  fsum3cvg  12072  summodclem2a  12075  fsumf1o  12084  fsum3cvg2  12088  fsumadd  12100  isummulc2  12120  fproddccvg  12266  fprodf1o  12282  prdsbas3  13521  txcnp  15185  cnmpt11  15197  cnmpt1t  15199  elplyd  15655  dvply1  15679  lgseisenlem2  15993
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