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Theorem cmpdom2 14482
Description: Domain of a class given by the "maps to" notation.
Hypothesis
Ref Expression
cmpdom2.1 |- F = (x e. A |-> (BGC))
Assertion
Ref Expression
cmpdom2 |- dom F = A
Distinct variable group:   x,A

Proof of Theorem cmpdom2
StepHypRef Expression
1 oprex 4907 . . . 4 |- (BGC) e. _V
21a1i 8 . . 3 |- (x e. A -> (BGC) e. _V)
32rgen 2159 . 2 |- A.x e. A (BGC) e. _V
4 cmpdom2.1 . . 3 |- F = (x e. A |-> (BGC))
54cmpdom 14481 . 2 |- (A.x e. A (BGC) e. _V <-> dom F = A)
63, 5mpbi 206 1 |- dom F = A
Colors of variables: wff set class
Syntax hints:   = wceq 1298   e. wcel 1300  A.wral 2105  _Vcvv 2292  dom cdm 3986  (class class class)co 4884   e. cmpt 5004
This theorem is referenced by:  trset 14756
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 1304  ax-gen 1305  ax-8 1306  ax-9 1307  ax-10 1308  ax-11 1309  ax-12 1310  ax-13 1311  ax-14 1312  ax-17 1317  ax-4 1319  ax-5o 1321  ax-6o 1324  ax-9o 1481  ax-10o 1500  ax-16 1580  ax-11o 1588  ax-ext 1865  ax-sep 3438  ax-nul 3445  ax-pow 3481  ax-pr 3524  ax-un 3790
This theorem depends on definitions:  df-bi 164  df-or 241  df-an 242  df-ex 1327  df-sb 1536  df-eu 1775  df-mo 1776  df-clab 1872  df-cleq 1877  df-clel 1880  df-ne 2019  df-ral 2109  df-rex 2110  df-v 2294  df-dif 2597  df-un 2600  df-in 2603  df-ss 2605  df-nul 2876  df-pw 3035  df-sn 3049  df-pr 3050  df-op 3053  df-uni 3178  df-br 3339  df-opab 3396  df-id 3586  df-xp 4000  df-rel 4001  df-cnv 4002  df-co 4003  df-dm 4004  df-rn 4005  df-fun 4008  df-fn 4009  df-fv 4014  df-opr 4886  df-mpt 5006
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