Theorem nfpw 3665

Description: Bound-variable hypothesis builder for power class. (Contributed by NM, 28-Oct-2003.) (Revised by Mario Carneiro, 13-Oct-2016.)

Hypothesis

Ref	Expression
nfpw.1	⊢ Ⅎ𝑥𝐴

Assertion

Ref	Expression
nfpw	⊢ Ⅎ𝑥𝒫 𝐴

Proof of Theorem nfpw

Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-pw 3654	. 2 ⊢ 𝒫 𝐴 = {𝑦 ∣ 𝑦 ⊆ 𝐴}
2		nfcv 2374	. . . 4 ⊢ Ⅎ𝑥𝑦
3		nfpw.1	. . . 4 ⊢ Ⅎ𝑥𝐴
4	2, 3	nfss 3220	. . 3 ⊢ Ⅎ𝑥 𝑦 ⊆ 𝐴
5	4	nfab 2379	. 2 ⊢ Ⅎ𝑥{𝑦 ∣ 𝑦 ⊆ 𝐴}
6	1, 5	nfcxfr 2371	1 ⊢ Ⅎ𝑥𝒫 𝐴

Syntax hints:  {cab 2217  Ⅎwnfc 2361   ⊆ wss 3200  𝒫 cpw 3652

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-ext 2213

This theorem depends on definitions:  df-bi 117  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-in 3206  df-ss 3213  df-pw 3654

This theorem is referenced by: (None)