Theorem nfralseu 17348

Description: Bound-variable hypothesis builder for "all some one" restricted to a class. This is the "all some one" counterpart of nfrals 17317. (Contributed by David A. Wheeler, 22-Jul-2026.)

Hypotheses

Ref	Expression
nfralseu.1	⊢ Ⅎ𝑥𝐴
nfralseu.2	⊢ Ⅎ𝑥𝜑
nfralseu.3	⊢ Ⅎ𝑥𝜓

Assertion

Ref	Expression
nfralseu	⊢ Ⅎ𝑥∀∃!𝑦 ∈ 𝐴(𝜑 → 𝜓)

Distinct variable group:   𝑥,𝑦

Allowed substitution hints:   𝜑(𝑥, 𝑦)   𝜓(𝑥, 𝑦)   𝐴(𝑥, 𝑦)

Proof of Theorem nfralseu

Step	Hyp	Ref	Expression
1		df-ralseu 17335	. 2 ⊢ (∀∃!𝑦 ∈ 𝐴(𝜑 → 𝜓) ↔ (∀𝑦 ∈ 𝐴 (𝜑 → 𝜓) ∧ ∃!𝑦 ∈ 𝐴 𝜑))
2		nfralseu.1	. . . 4 ⊢ Ⅎ𝑥𝐴
3		nfralseu.2	. . . . 5 ⊢ Ⅎ𝑥𝜑
4		nfralseu.3	. . . . 5 ⊢ Ⅎ𝑥𝜓
5	3, 4	nfim 1625	. . . 4 ⊢ Ⅎ𝑥(𝜑 → 𝜓)
6	2, 5	nfralw 2587	. . 3 ⊢ Ⅎ𝑥∀𝑦 ∈ 𝐴 (𝜑 → 𝜓)
7	2, 3	nfreuw 2726	. . 3 ⊢ Ⅎ𝑥∃!𝑦 ∈ 𝐴 𝜑
8	6, 7	nfan 1618	. 2 ⊢ Ⅎ𝑥(∀𝑦 ∈ 𝐴 (𝜑 → 𝜓) ∧ ∃!𝑦 ∈ 𝐴 𝜑)
9	1, 8	nfxfr 1527	1 ⊢ Ⅎ𝑥∀∃!𝑦 ∈ 𝐴(𝜑 → 𝜓)

This proof depends on syntax axioms:   → wi 4   ∧ wa 104  Ⅎwnf 1513  Ⅎwnfc 2379  ∀wral 2528  ∃!wreu 2530  ∀∃!wralseu 17333

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220

This proof depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-reu 2535  df-ralseu 17335

This theorem is used by: (None)