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Mirrors > Home > ILE Home > Th. List > truan | GIF version |
Description: True can be removed from a conjunction. (Contributed by FL, 20-Mar-2011.) (Proof shortened by Wolf Lammen, 21-Jul-2019.) |
Ref | Expression |
---|---|
truan | ⊢ ((⊤ ∧ 𝜑) ↔ 𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | tru 1247 | . . 3 ⊢ ⊤ | |
2 | 1 | biantrur 287 | . 2 ⊢ (𝜑 ↔ (⊤ ∧ 𝜑)) |
3 | 2 | bicomi 123 | 1 ⊢ ((⊤ ∧ 𝜑) ↔ 𝜑) |
Colors of variables: wff set class |
Syntax hints: ∧ wa 97 ↔ wb 98 ⊤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 |
This theorem depends on definitions: df-bi 110 df-tru 1246 |
This theorem is referenced by: truanfal 1293 truxortru 1310 truxorfal 1311 |
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