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Theorem r19.28av 2695
 Description: Restricted version of one direction of Theorem 19.28 of [Margaris] p. 90. (The other direction doesn't hold when is empty.) (Contributed by NM, 2-Apr-2004.)
Assertion
Ref Expression
r19.28av
Distinct variable group:   ,
Allowed substitution hints:   ()   ()

Proof of Theorem r19.28av
StepHypRef Expression
1 r19.27av 2694 . 2
2 ancom 437 . 2
3 ancom 437 . . 3
43ralbii 2580 . 2
51, 2, 43imtr4i 257 1
 Colors of variables: wff set class Syntax hints:   wi 4   wa 358  wral 2556 This theorem is referenced by:  rr19.28v  2923  fununi  5332  txlm  17358 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661  ax-11 1727 This theorem depends on definitions:  df-bi 177  df-an 360  df-tru 1310  df-nf 1535  df-ral 2561
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