Theorem xorbi12i 1378

Description: Equality property for XOR. (Contributed by Mario Carneiro, 4-Sep-2016.)

Hypotheses

Ref	Expression
xorbi12.1	|- ( ph <-> ps )
xorbi12.2	|- ( ch <-> th )

Assertion

Ref	Expression
xorbi12i	|- ( ( ph \/_ ch ) <-> ( ps \/_ th ) )

Proof of Theorem xorbi12i

Step	Hyp	Ref	Expression
1		xorbi12.1	. . . 4 |- ( ph <-> ps )
2	1	a1i 9	. . 3 |- ( T. -> ( ph <-> ps ) )
3		xorbi12.2	. . . 4 |- ( ch <-> th )
4	3	a1i 9	. . 3 |- ( T. -> ( ch <-> th ) )
5	2, 4	xorbi12d 1377	. 2 |- ( T. -> ( ( ph \/_ ch ) <-> ( ps \/_ th ) ) )
6	5	mptru 1357	1 |- ( ( ph \/_ ch ) <-> ( ps \/_ th ) )

Syntax hints:   <-> wb 104   T. wtru 1349   \/_ wxo 1370

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 609  ax-in2 610  ax-io 704

This theorem depends on definitions:  df-bi 116  df-tru 1351  df-xor 1371

This theorem is referenced by: (None)