Theorem sbid2v 2201

Description: An identity law for substitution. Used in proof of Theorem 9.7 of [Megill] p. 449 (p. 16 of the preprint). (Contributed by NM, 5-Aug-1993.)

Assertion

Ref	Expression
sbid2v

Distinct variable group:   ,

Proof of Theorem sbid2v

Step	Hyp	Ref	Expression
1		nfv 1707	. 2
2	1	sbid2 2155	1

Syntax hints:  <->wb 184  [wsb 1739

This theorem is referenced by:  sbelx  2202  sbco4lem  2209

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  ax-7 1790  ax-10 1837  ax-12 1854  ax-13 1999

This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-ex 1613  df-nf 1617  df-sb 1740