Theorem elmpt2cl2 5700

Description: If a two-parameter class is not empty, the second argument is in its nominal domain. (Contributed by FL, 15-Oct-2012.) (Revised by Stefan O'Rear, 7-Mar-2015.)

Hypothesis

Ref	Expression
elmpt2cl.f	|- F = ( x e. A , y e. B |-> C )

Assertion

Ref	Expression
elmpt2cl2	|- ( X e. ( S F T ) -> T e. B )

Distinct variable groups:   x, A, y   x, B, y

Allowed substitution hints:   C( x, y)   S( x, y)   T( x, y)   F( x, y)   X( x, y)

Proof of Theorem elmpt2cl2

Step	Hyp	Ref	Expression
1		elmpt2cl.f	. . 3 |- F = ( x e. A , y e. B |-> C )
2	1	elmpt2cl 5698	. 2 |- ( X e. ( S F T ) -> ( S e. A /\ T e. B ) )
3	2	simprd 107	1 |- ( X e. ( S F T ) -> T e. B )

Syntax hints:   -> wi 4   = wceq 1243   e. wcel 1393  (class class class)co 5512   |-> cmpt2 5514

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-14 1405  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022  ax-sep 3875  ax-pow 3927  ax-pr 3944

This theorem depends on definitions:  df-bi 110  df-3an 887  df-tru 1246  df-nf 1350  df-sb 1646  df-eu 1903  df-mo 1904  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-ral 2311  df-rex 2312  df-v 2559  df-un 2922  df-in 2924  df-ss 2931  df-pw 3361  df-sn 3381  df-pr 3382  df-op 3384  df-uni 3581  df-br 3765  df-opab 3819  df-id 4030  df-xp 4351  df-rel 4352  df-cnv 4353  df-co 4354  df-dm 4355  df-iota 4867  df-fun 4904  df-fv 4910  df-ov 5515  df-oprab 5516  df-mpt2 5517

This theorem is referenced by:  iccssico2  8816  elfzoel2  9003