Theorem equsb2 2108

Description: Substitution applied to an atomic wff. (Contributed by NM, 10-May-1993.)

Assertion

Ref	Expression
equsb2

Proof of Theorem equsb2

Step	Hyp	Ref	Expression
1		sb2 2093	. 2
2		equcomi 1793	. 2
3	1, 2	mpg 1620	1

Syntax hints:  ->wi 4  [wsb 1739

This theorem is referenced by:  sbidmOLD  2157

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-12 1854  ax-13 1999

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