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Description: Deduction conjoining antecedent to left of consequent in nested implication. (Contributed by NM, 10-Aug-1994) (Proof shortened by Wolf Lammen, 7-Dec-2012)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | anc2li.1 | ⊢ ( 𝜑 → ( 𝜓 → 𝜒 ) ) | |
| Assertion | anc2li | ⊢ ( 𝜑 → ( 𝜓 → ( 𝜑 ∧ 𝜒 ) ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | anc2li.1 | ⊢ ( 𝜑 → ( 𝜓 → 𝜒 ) ) | |
| 2 | id | ⊢ ( 𝜑 → 𝜑 ) | |
| 3 | 1 2 | jctild | ⊢ ( 𝜑 → ( 𝜓 → ( 𝜑 ∧ 𝜒 ) ) ) |