Theorem truthtbltbit-P4.39a 507

Description: ( T ↔ T ) ⇔ T. †

Assertion

Ref	Expression
truthtbltbit-P4.39a	⊢ ((⊤ ↔ ⊤) ↔ ⊤)

Proof of Theorem truthtbltbit-P4.39a

Step	Hyp	Ref	Expression
1		biref-P3.33a 297	. 2 ⊢ (⊤ ↔ ⊤)
2	1	thmeqtrue-P4.21a 442	1 ⊢ ((⊤ ↔ ⊤) ↔ ⊤)

Syntax hints:   ↔ wff-bi 104  ⊤wff-true 153

This theorem was proved from axioms:  ax-L1 11  ax-L2 12  ax-L3 13  ax-MP 14

This theorem depends on definitions:  df-bi-D2.1 107  df-and-D2.2 133  df-true-D2.4 155

This theorem is referenced by: (None)