Theorem truxorfal 1579

Description: A ⊻ identity. (Contributed by David A. Wheeler, 8-May-2015.)

Assertion

Ref	Expression
truxorfal	⊢ ((⊤ ⊻ ⊥) ↔ ⊤)

Proof of Theorem truxorfal

Step	Hyp	Ref	Expression
1		df-xor 1501	. . 3 ⊢ ((⊤ ⊻ ⊥) ↔ ¬ (⊤ ↔ ⊥))
2		trubifal 1564	. . 3 ⊢ ((⊤ ↔ ⊥) ↔ ⊥)
3	1, 2	xchbinx 336	. 2 ⊢ ((⊤ ⊻ ⊥) ↔ ¬ ⊥)
4		notfal 1561	. 2 ⊢ (¬ ⊥ ↔ ⊤)
5	3, 4	bitri 277	1 ⊢ ((⊤ ⊻ ⊥) ↔ ⊤)

Syntax hints:  ¬ wn 3   ↔ wb 208   ⊻ wxo 1500  ⊤wtru 1534  ⊥wfal 1545

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 209  df-xor 1501  df-tru 1536  df-fal 1546

This theorem is referenced by:  falxortru  1580