Theorem 3anbi2i 1188

Description: Inference adding two conjuncts to each side of a biconditional. (Contributed by NM, 8-Sep-2006.)

Hypothesis

Ref	Expression
3anbi1i.1

Assertion

Ref	Expression
3anbi2i

Proof of Theorem 3anbi2i

Step	Hyp	Ref	Expression
1		biid 236	. 2
2		3anbi1i.1	. 2
3		biid 236	. 2
4	1, 2, 3	3anbi123i 1185	1

Syntax hints:  <->wb 184  /\w3a 973

This theorem is referenced by:  f13dfv  6180  axgroth4  9231  brfi1uzind  12532  cusgra3v  24464  bnj543  33951  bnj916  33991

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

This theorem depends on definitions:  df-bi 185  df-an 371  df-3an 975