Theorem truortru 1296

Description: A ∨ identity. (Contributed by Anthony Hart, 22-Oct-2010.) (Proof shortened by Andrew Salmon, 13-May-2011.)

Assertion

Ref	Expression
truortru	⊢ ((⊤ ∨ ⊤) ↔ ⊤)

Proof of Theorem truortru

Step	Hyp	Ref	Expression
1		oridm 674	1 ⊢ ((⊤ ∨ ⊤) ↔ ⊤)

Syntax hints:   ↔ wb 98   ∨ wo 629  ⊤wtru 1244

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630

This theorem depends on definitions:  df-bi 110

This theorem is referenced by: (None)