Theorem elpwi 3442

Description: Subset relation implied by membership in a power class. (Contributed by NM, 17-Feb-2007.)

Assertion

Ref	Expression
elpwi	⊢ (𝐴 ∈ 𝒫 𝐵 → 𝐴 ⊆ 𝐵)

Proof of Theorem elpwi

Step	Hyp	Ref	Expression
1		elpwg 3441	. 2 ⊢ (𝐴 ∈ 𝒫 𝐵 → (𝐴 ∈ 𝒫 𝐵 ↔ 𝐴 ⊆ 𝐵))
2	1	ibi 175	1 ⊢ (𝐴 ∈ 𝒫 𝐵 → 𝐴 ⊆ 𝐵)

Syntax hints:   → wi 4   ∈ wcel 1439   ⊆ wss 3000  𝒫 cpw 3433

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 666  ax-5 1382  ax-7 1383  ax-gen 1384  ax-ie1 1428  ax-ie2 1429  ax-8 1441  ax-10 1442  ax-11 1443  ax-i12 1444  ax-bndl 1445  ax-4 1446  ax-17 1465  ax-i9 1469  ax-ial 1473  ax-i5r 1474  ax-ext 2071

This theorem depends on definitions:  df-bi 116  df-tru 1293  df-nf 1396  df-sb 1694  df-clab 2076  df-cleq 2082  df-clel 2085  df-nfc 2218  df-v 2622  df-in 3006  df-ss 3013  df-pw 3435

This theorem is referenced by:  elpwid  3444  elelpwi  3445  elpw2g  3998  eldifpw  4312  iunpw  4315  f1opw2  5864