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Theorem filusb 10561
Description: The underlying set belongs to the filter.
Hypothesis
Ref Expression
filusb.1 |- X = U.F
Assertion
Ref Expression
filusb |- (F e. Fil -> X e. F)

Proof of Theorem filusb
StepHypRef Expression
1 filusb.1 . . . . 5 |- X = U.F
21isfil 10558 . . . 4 |- (F e. Fil -> (F e. Fil <-> ((-. (/) e. F /\ X e. F) /\ A.xA.y((x e. F /\ y (_ X /\ x (_ y) -> y e. F) /\ A.x e. F A.y e. F (x i^i y) e. F)))
32ibi 592 . . 3 |- (F e. Fil -> ((-. (/) e. F /\ X e. F) /\ A.xA.y((x e. F /\ y (_ X /\ x (_ y) -> y e. F) /\ A.x e. F A.y e. F (x i^i y) e. F))
433simp1d 794 . 2 |- (F e. Fil -> (-. (/) e. F /\ X e. F))
54pm3.27d 325 1 |- (F e. Fil -> X e. F)
Colors of variables: wff set class
Syntax hints:  -. wn 2   -> wi 3   /\ wa 223   /\ w3a 775  A.wal 954   = wceq 956   e. wcel 958  A.wral 1645   i^i cin 2046   (_ wss 2047  (/)c0 2280  U.cuni 2503  Filcfil 10556
This theorem is referenced by:  emnfil 10566  filintf 10569
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-12 968  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
This theorem depends on definitions:  df-bi 147  df-an 225  df-3an 777  df-ex 981  df-sb 1172  df-clab 1464  df-cleq 1469  df-clel 1472  df-ral 1649  df-v 1812  df-in 2051  df-ss 2053  df-uni 2504  df-fil 10557
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