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Theorem hbco 2508
Description: Bound-variable hypothesis builder for function value.
Hypotheses
Ref Expression
hbco.1 |- (y e. A -> A.x y e. A)
hbco.2 |- (y e. B -> A.x y e. B)
Assertion
Ref Expression
hbco |- (y e. (A o. B) -> A.x y e. (A o. B))
Distinct variable group(s):   y,A   y,B   x,y

Proof of Theorem hbco
StepHypRef Expression
1 ax-17 925 . . . . . 6 |- (y e. z -> A.x y e. z)
2 hbco.2 . . . . . 6 |- (y e. B -> A.x y e. B)
3 ax-17 925 . . . . . 6 |- (y e. v -> A.x y e. v)
41, 2, 3hbbr 2095 . . . . 5 |- (zBv -> A.x zBv)
5 hbco.1 . . . . . 6 |- (y e. A -> A.x y e. A)
6 ax-17 925 . . . . . 6 |- (y e. w -> A.x y e. w)
73, 5, 6hbbr 2095 . . . . 5 |- (vAw -> A.x vAw)
84, 7hban 704 . . . 4 |- ((zBv /\ vAw) -> A.x(zBv /\ vAw))
98hbex 701 . . 3 |- (E.v(zBv /\ vAw) -> A.xE.v(zBv /\ vAw))
109hbopab 2111 . 2 |- (y e. {<.z, w>. | E.v(zBv /\ vAw)} -> A.x y e. {<.z, w>. | E.v(zBv /\ vAw)})
11 df-co 2427 . . 3 |- (A o. B) = {<.z, w>. | E.v(zBv /\ vAw)}
1211eleq2i 1153 . 2 |- (y e. (A o. B) <-> y e. {<.z, w>. | E.v(zBv /\ vAw)})
1312bial 695 . 2 |- (A.x y e. (A o. B) <-> A.x y e. {<.z, w>. | E.v(zBv /\ vAw)})
1410, 12, 133imtr4 192 1 |- (y e. (A o. B) -> A.x y e. (A o. B))
Colors of variables: wff set class
Syntax hints:   -> wi 2   /\ wa 196  A.wal 672  E.wex 678   e. wel 803   e. wcel 1092   class class class wbr 2054  {copab 2055   o. ccom 2414
This theorem is referenced by:  hbfun 2684  ac6lem 3575
This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-13 804  ax-14 805  ax-16 922  ax-17 925  ax-ext 1074  ax-rep 1075  ax-pow 1077
This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-ex 679  df-sb 853  df-clab 1093  df-cleq 1097  df-clel 1099  df-v 1349  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-nul 1708  df-pw 1799  df-sn 1811  df-pr 1812  df-op 1815  df-br 2063  df-opab 2098  df-co 2427
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