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Mirrors > Home > ILE Home > Th. List > simplll | GIF version |
Description: Simplification of a conjunction. (Contributed by Jeff Hankins, 28-Jul-2009.) |
Ref | Expression |
---|---|
simplll | ⊢ ((((𝜑 ∧ 𝜓) ∧ 𝜒) ∧ 𝜃) → 𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpl 108 | . 2 ⊢ ((𝜑 ∧ 𝜓) → 𝜑) | |
2 | 1 | ad2antrr 485 | 1 ⊢ ((((𝜑 ∧ 𝜓) ∧ 𝜒) ∧ 𝜃) → 𝜑) |
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