Theorem brralrspcev 4047

Description: Restricted existential specialization with a restricted universal quantifier over a relation, closed form. (Contributed by AV, 20-Aug-2022.)

Assertion

Ref	Expression
brralrspcev	|- ( ( B e. X /\ A. y e. Y A R B ) -> E. x e. X A. y e. Y A R x )

Distinct variable groups:   x, A   x, B, y   x, R   x, X   x, Y

Allowed substitution hints:   A( y)   R( y)   X( y)   Y( y)

Proof of Theorem brralrspcev

Step	Hyp	Ref	Expression
1		breq2 3993	. . 3 |- ( x = B -> ( A R x <-> A R B ) )
2	1	ralbidv 2470	. 2 |- ( x = B -> ( A. y e. Y A R x <-> A. y e. Y A R B ) )
3	2	rspcev 2834	1 |- ( ( B e. X /\ A. y e. Y A R B ) -> E. x e. X A. y e. Y A R x )

Syntax hints:   -> wi 4   /\ wa 103   = wceq 1348   e. wcel 2141   A.wral 2448   E.wrex 2449   class class class wbr 3989

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-ext 2152

This theorem depends on definitions:  df-bi 116  df-3an 975  df-tru 1351  df-nf 1454  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ral 2453  df-rex 2454  df-v 2732  df-un 3125  df-sn 3589  df-pr 3590  df-op 3592  df-br 3990

This theorem is referenced by:  axpre-suploclemres  7863  fiubm  10763  dedekindeulemub  13390  suplociccreex  13396  dedekindicclemub  13399