Theorem 0elpw 4247

Description: Every power class contains the empty set. (Contributed by NM, 25-Oct-2007.)

Assertion

Ref	Expression
0elpw	⊢ ∅ ∈ 𝒫 𝐴

Proof of Theorem 0elpw

Step	Hyp	Ref	Expression
1		0ss 3530	. 2 ⊢ ∅ ⊆ 𝐴
2		0ex 4210	. . 3 ⊢ ∅ ∈ V
3	2	elpw 3655	. 2 ⊢ (∅ ∈ 𝒫 𝐴 ↔ ∅ ⊆ 𝐴)
4	1, 3	mpbir 146	1 ⊢ ∅ ∈ 𝒫 𝐴

Syntax hints:   ∈ wcel 2200   ⊆ wss 3197  ∅c0 3491  𝒫 cpw 3649

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-in1 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-ext 2211  ax-nul 4209

This theorem depends on definitions:  df-bi 117  df-tru 1398  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-v 2801  df-dif 3199  df-in 3203  df-ss 3210  df-nul 3492  df-pw 3651

This theorem is referenced by:  ordpwsucexmid  4659  pw1on  7399  pw1ne0  7401  pw1nct  16300