Theorem 2nexaln 1651

Description: Theorem *11.25 in [WhiteheadRussell] p. 160. (Contributed by Andrew Salmon, 24-May-2011.)

Assertion

Ref	Expression
2nexaln

Proof of Theorem 2nexaln

Step	Hyp	Ref	Expression
1		2exnaln 1650	. . 3
2	1	bicomi 202	. 2
3	2	con1bii 331	1

Syntax hints:  -.wn 3  <->wb 184  A.wal 1393  E.wex 1612

This theorem is referenced by:  2mo  2373  2moOLD  2374  swrd0  12658  2spotdisj  25061  pm11.63  31301

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

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