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Theorem funfv2 3771
Description: The value of a function. Definition of function value in [Enderton] p. 43.
Assertion
Ref Expression
funfv2 |- (Fun F -> (F` A) = U.{y | AFy})
Distinct variable groups:   y,A   y,F

Proof of Theorem funfv2
StepHypRef Expression
1 funfv 3770 . 2 |- (Fun F -> (F` A) = U.(F"{A}))
2 funrel 3533 . . . 4 |- (Fun F -> Rel F)
3 relimasn 3425 . . . 4 |- (Rel F -> (F"{A}) = {y | AFy})
42, 3syl 10 . . 3 |- (Fun F -> (F"{A}) = {y | AFy})
54unieqd 2512 . 2 |- (Fun F -> U.(F"{A}) = U.{y | AFy})
61, 5eqtrd 1507 1 |- (Fun F -> (F` A) = U.{y | AFy})
Colors of variables: wff set class
Syntax hints:   -> wi 3   = wceq 956  {cab 1463  {csn 2409  U.cuni 2503   class class class wbr 2619  "cima 3173  Rel wrel 3175  Fun wfun 3176  ` cfv 3182
This theorem is referenced by:  funfv2f 3772
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 962  ax-gen 963  ax-8 964  ax-10 966  ax-11 967  ax-12 968  ax-13 969  ax-14 970  ax-17 971  ax-4 973  ax-5o 975  ax-6o 978  ax-9o 1123  ax-10o 1140  ax-16 1210  ax-11o 1218  ax-ext 1459  ax-sep 2703  ax-pow 2742  ax-pr 2779  ax-un 2866
This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-ex 981  df-sb 1172  df-eu 1382  df-mo 1383  df-clab 1464  df-cleq 1469  df-clel 1472  df-ne 1587  df-ral 1649  df-rex 1650  df-v 1812  df-dif 2049  df-un 2050  df-in 2051  df-ss 2053  df-nul 2281  df-pw 2402  df-sn 2412  df-pr 2413  df-op 2416  df-uni 2504  df-br 2620  df-opab 2667  df-id 2835  df-xp 3184  df-rel 3185  df-cnv 3186  df-co 3187  df-dm 3188  df-rn 3189  df-res 3190  df-ima 3191  df-fun 3192  df-fn 3193  df-fv 3198
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