Theorem truxortru 1528

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

Assertion

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

Proof of Theorem truxortru

Step	Hyp	Ref	Expression
1		df-xor 1465	. . 3 ⊢ ((⊤ ⊻ ⊤) ↔ ¬ (⊤ ↔ ⊤))
2		trubitru 1520	. . 3 ⊢ ((⊤ ↔ ⊤) ↔ ⊤)
3	1, 2	xchbinx 324	. 2 ⊢ ((⊤ ⊻ ⊤) ↔ ¬ ⊤)
4		nottru 1518	. 2 ⊢ (¬ ⊤ ↔ ⊥)
5	3, 4	bitri 264	1 ⊢ ((⊤ ⊻ ⊤) ↔ ⊥)

Syntax hints:  ¬ wn 3   ↔ wb 196   ⊻ wxo 1464  ⊤wtru 1484  ⊥wfal 1488

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 197  df-xor 1465  df-tru 1486  df-fal 1489

This theorem is referenced by: (None)