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Metamath Proof Explorer

Theorem 2a1d

Description: Deduction introducing two antecedents. Two applications of a1d . Deduction associated with 2a1 and 2a1i . (Contributed by BJ, 10-Aug-2020)

		Ref	Expression
	Hypothesis	2a1d.1	$⊢ φ \to ψ$
	Assertion	2a1d	$⊢ φ \to (χ \to (θ \to ψ))$

Proof

Step	Hyp	Ref	Expression
1		2a1d.1	$⊢ φ \to ψ$
2	1	a1d	$⊢ φ \to (θ \to ψ)$
3	2	a1d	$⊢ φ \to (χ \to (θ \to ψ))$