Theorem bilanri 389

Description: Inference adding a conjunct to the right-hand side of a biconditional. (Contributed by Matthew House, 22-May-2026.)

Hypothesis

Ref	Expression
birani.1	⊢ (𝜑 ↔ 𝜓)

Assertion

Ref	Expression
bilanri	⊢ ((𝜒 ∧ 𝜓) → 𝜑)

Proof of Theorem bilanri

Step	Hyp	Ref	Expression
1		birani.1	. . 3 ⊢ (𝜑 ↔ 𝜓)
2	1	biimpri 133	. 2 ⊢ (𝜓 → 𝜑)
3	2	adantl 277	1 ⊢ ((𝜒 ∧ 𝜓) → 𝜑)

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105

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

This theorem depends on definitions:  df-bi 117

This theorem is referenced by: (None)