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Theorem iinss 2025
Description: Subset implication for an indexed intersection.
Assertion
Ref Expression
iinss |- (E.x e. A B (_ C -> |^|x e. A B (_ C)
Distinct variable group(s):   x,C   x,A

Proof of Theorem iinss
StepHypRef Expression
1 19.12 729 . . . 4 |- (E.xA.y(x e. A /\ (y e. B -> y e. C)) -> A.yE.x(x e. A /\ (y e. B -> y e. C)))
2 df-rex 1206 . . . . 5 |- (E.x e. A A.y(y e. B -> y e. C) <-> E.x(x e. A /\ A.y(y e. B -> y e. C)))
3 19.28v 957 . . . . . 6 |- (A.y(x e. A /\ (y e. B -> y e. C)) <-> (x e. A /\ A.y(y e. B -> y e. C)))
43biex 733 . . . . 5 |- (E.xA.y(x e. A /\ (y e. B -> y e. C)) <-> E.x(x e. A /\ A.y(y e. B -> y e. C)))
52, 4bitr4 154 . . . 4 |- (E.x e. A A.y(y e. B -> y e. C) <-> E.xA.y(x e. A /\ (y e. B -> y e. C)))
6 df-rex 1206 . . . . 5 |- (E.x e. A (y e. B -> y e. C) <-> E.x(x e. A /\ (y e. B -> y e. C)))
76bial 695 . . . 4 |- (A.yE.x e. A (y e. B -> y e. C) <-> A.yE.x(x e. A /\ (y e. B -> y e. C)))
81, 5, 73imtr4 192 . . 3 |- (E.x e. A A.y(y e. B -> y e. C) -> A.yE.x e. A (y e. B -> y e. C))
9 r19.36av 1299 . . . . 5 |- (E.x e. A (y e. B -> y e. C) -> (A.x e. A y e. B -> y e. C))
10 visset 1350 . . . . . 6 |- y e. V
11 eliin 1999 . . . . . 6 |- (y e. V -> (y e. |^|x e. A B <-> A.x e. A y e. B))
1210, 11ax-mp 6 . . . . 5 |- (y e. |^|x e. A B <-> A.x e. A y e. B)
139, 12syl5ib 181 . . . 4 |- (E.x e. A (y e. B -> y e. C) -> (y e. |^|x e. A B -> y e. C))
141319.20i 691 . . 3 |- (A.yE.x e. A (y e. B -> y e. C) -> A.y(y e. |^|x e. A B -> y e. C))
158, 14syl 12 . 2 |- (E.x e. A A.y(y e. B -> y e. C) -> A.y(y e. |^|x e. A B -> y e. C))
16 dfss2 1497 . . 3 |- (B (_ C <-> A.y(y e. B -> y e. C))
1716birex 1224 . 2 |- (E.x e. A B (_ C <-> E.x e. A A.y(y e. B -> y e. C))
18 dfss2 1497 . 2 |- (|^|x e. A B (_ C <-> A.y(y e. |^|x e. A B -> y e. C))
1915, 17, 183imtr4 192 1 |- (E.x e. A B (_ C -> |^|x e. A B (_ C)
Colors of variables: wff set class
Syntax hints:   -> wi 2   <-> wb 127   /\ wa 196  A.wal 672  E.wex 678   e. wcel 1092  A.wral 1201  E.wrex 1202  Vcvv 1348   (_ wss 1487  |^|ciin 1995
This theorem is referenced by:  scott0 3542
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-16 922  ax-17 925  ax-ext 1074
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-ral 1205  df-rex 1206  df-v 1349  df-in 1491  df-ss 1492  df-iin 1997
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