Theorem nfan1c 35703

Description: Variant of nfan 1932 and commuted form of nfan1 2237. (Contributed by BTernaryTau, 31-Jul-2025.)

Hypotheses

Ref	Expression
nfan1c.1	⊢ Ⅎ𝑥𝜑
nfan1c.2	⊢ (𝜑 → Ⅎ𝑥𝜓)

Assertion

Ref	Expression
nfan1c	⊢ Ⅎ𝑥(𝜓 ∧ 𝜑)

Proof of Theorem nfan1c

Step	Hyp	Ref	Expression
1		nfan1c.1	. . 3 ⊢ Ⅎ𝑥𝜑
2		nfan1c.2	. . 3 ⊢ (𝜑 → Ⅎ𝑥𝜓)
3	1, 2	nfan1 2237	. 2 ⊢ Ⅎ𝑥(𝜑 ∧ 𝜓)
4		ancom 466	. . 3 ⊢ ((𝜑 ∧ 𝜓) ↔ (𝜓 ∧ 𝜑))
5	4	nfbii 1885	. 2 ⊢ (Ⅎ𝑥(𝜑 ∧ 𝜓) ↔ Ⅎ𝑥(𝜓 ∧ 𝜑))
6	3, 5	mpbi 233	1 ⊢ Ⅎ𝑥(𝜓 ∧ 𝜑)

This proof depends on syntax axioms:   → wi 4   ∧ wa 401  Ⅎwnf 1816

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-12 2213

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-ex 1813  df-nf 1817

This theorem is used by:  dvelimalcased  35705  dvelimexcased  35707