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Theorem fldrels 14449
Description: The field of a relation is a set.
Hypothesis
Ref Expression
fldrels.1 |- X = U.U.R
Assertion
Ref Expression
fldrels |- (R e. S -> X e. _V)

Proof of Theorem fldrels
StepHypRef Expression
1 uniexg 3795 . 2 |- (R e. S -> U.R e. _V)
2 uniexg 3795 . 2 |- (U.R e. _V -> U.U.R e. _V)
3 fldrels.1 . . . . 5 |- X = U.U.R
43eqcomi 1888 . . . 4 |- U.U.R = X
54eleq1i 1960 . . 3 |- (U.U.R e. _V <-> X e. _V)
65biimpi 168 . 2 |- (U.U.R e. _V -> X e. _V)
71, 2, 63syl 24 1 |- (R e. S -> X e. _V)
Colors of variables: wff set class
Syntax hints:   -> wi 3   = wceq 1298   e. wcel 1300  _Vcvv 2292  U.cuni 3177
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-un 3790
This theorem depends on definitions:  df-bi 164  df-or 241  df-an 242  df-ex 1327  df-sb 1536  df-clab 1872  df-cleq 1877  df-clel 1880  df-rex 2110  df-v 2294  df-uni 3178
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