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Theorem r2al 2483
Description: Double restricted universal quantification. (Contributed by NM, 19-Nov-1995.)
Assertion
Ref Expression
r2al  |-  ( A. x  e.  A  A. y  e.  B  ph  <->  A. x A. y ( ( x  e.  A  /\  y  e.  B )  ->  ph )
)
Distinct variable groups:    x, y    y, A
Allowed substitution hints:    ph( x, y)    A( x)    B( x, y)

Proof of Theorem r2al
StepHypRef Expression
1 nfcv 2306 . 2  |-  F/_ y A
21r2alf 2481 1  |-  ( A. x  e.  A  A. y  e.  B  ph  <->  A. x A. y ( ( x  e.  A  /\  y  e.  B )  ->  ph )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    <-> wb 104   A.wal 1340    e. wcel 2135   A.wral 2442
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 699  ax-5 1434  ax-7 1435  ax-gen 1436  ax-ie1 1480  ax-ie2 1481  ax-8 1491  ax-10 1492  ax-11 1493  ax-i12 1494  ax-bndl 1496  ax-4 1497  ax-17 1513  ax-i9 1517  ax-ial 1521  ax-i5r 1522  ax-ext 2146
This theorem depends on definitions:  df-bi 116  df-nf 1448  df-sb 1750  df-cleq 2157  df-clel 2160  df-nfc 2295  df-ral 2447
This theorem is referenced by:  r3al  2508  raliunxp  4739  codir  4986  qfto  4987  fununi  5250  dff13  5730  mpo2eqb  5942  qliftfun  6574  cnmpt12  12828  cnmpt22  12835
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