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Theorem r19.37 2760
Description: Restricted version of one direction of Theorem 19.37 of [Margaris] p. 90. (The other direction doesn't hold when is empty.) (Contributed by FL, 13-May-2012.) (Revised by Mario Carneiro, 11-Dec-2016.)
Hypothesis
Ref Expression
r19.37.1  F/
Assertion
Ref Expression
r19.37

Proof of Theorem r19.37
StepHypRef Expression
1 r19.35 2758 . 2
2 r19.37.1 . . . 4  F/
3 ax-1 5 . . . 4
42, 3ralrimi 2695 . . 3
54imim1i 54 . 2
61, 5sylbi 187 1
Colors of variables: wff set class
Syntax hints:   wi 4   F/wnf 1544   wcel 1710  wral 2614  wrex 2615
This theorem is referenced by:  r19.37av  2761
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-11 1746
This theorem depends on definitions:  df-bi 177  df-an 360  df-tru 1319  df-ex 1542  df-nf 1545  df-ral 2619  df-rex 2620
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