Theorem sb2imi 2079

Description: Distribute substitution over implication. Compare al2imi 1819. (Contributed by Steven Nguyen, 13-Aug-2023.)

Hypothesis

Ref	Expression
sb2imi.1	⊢ (𝜑 → (𝜓 → 𝜒))

Assertion

Ref	Expression
sb2imi	⊢ ([𝑡 / 𝑥]𝜑 → ([𝑡 / 𝑥]𝜓 → [𝑡 / 𝑥]𝜒))

Proof of Theorem sb2imi

Step	Hyp	Ref	Expression
1		sb2imi.1	. . 3 ⊢ (𝜑 → (𝜓 → 𝜒))
2	1	sbimi 2078	. 2 ⊢ ([𝑡 / 𝑥]𝜑 → [𝑡 / 𝑥](𝜓 → 𝜒))
3		sbi1 2075	. 2 ⊢ ([𝑡 / 𝑥](𝜓 → 𝜒) → ([𝑡 / 𝑥]𝜓 → [𝑡 / 𝑥]𝜒))
4	2, 3	syl 17	1 ⊢ ([𝑡 / 𝑥]𝜑 → ([𝑡 / 𝑥]𝜓 → [𝑡 / 𝑥]𝜒))

Syntax hints:   → wi 4  [wsb 2068

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813

This theorem depends on definitions:  df-bi 206  df-sb 2069

This theorem is referenced by:  sban  2084  sbn1  2107