Theorem 19.27v 1766

Description: Version of 19.27 1923 with a dv condition, requiring fewer axioms. (Contributed by NM, 3-Jun-2004.)

Assertion

Ref	Expression
19.27v

Distinct variable group:   ,

Proof of Theorem 19.27v

Step	Hyp	Ref	Expression
1		19.26 1680	. 2
2		19.3v 1755	. . 3
3	2	anbi2i 694	. 2
4	1, 3	bitri 249	1

Syntax hints:  <->wb 184  /\wa 369  A.wal 1393

This theorem is referenced by:  rexrsb  32174

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1618  ax-4 1631  ax-5 1704  ax-6 1747

This theorem depends on definitions:  df-bi 185  df-an 371  df-ex 1613