Theorem truortru 1405

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 757	1 ⊢ ((⊤ ∨ ⊤) ↔ ⊤)

Syntax hints:   ↔ wb 105   ∨ wo 708  ⊤wtru 1354

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 709

This theorem depends on definitions:  df-bi 117

This theorem is referenced by: (None)