Theorem nfan1c 35329

Description: Variant of nfan 1918 and commuted form of nfan1 2234. (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 2234	. 2 ⊢ Ⅎ𝑥(𝜑 ∧ 𝜓)
4		ancom 464	. . 3 ⊢ ((𝜑 ∧ 𝜓) ↔ (𝜓 ∧ 𝜑))
5	4	nfbii 1871	. 2 ⊢ (Ⅎ𝑥(𝜑 ∧ 𝜓) ↔ Ⅎ𝑥(𝜓 ∧ 𝜑))
6	3, 5	mpbi 232	1 ⊢ Ⅎ𝑥(𝜓 ∧ 𝜑)

Syntax hints:   → wi 4   ∧ wa 399  Ⅎwnf 1802

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-12 2211

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-ex 1799  df-nf 1803

This theorem is referenced by:  dvelimalcased  35331  dvelimexcased  35333