Theorem ne0ii 3319

Description: If a class has elements, then it is nonempty. Inference associated with ne0i 3316. (Contributed by Glauco Siliprandi, 11-Dec-2019.)

Hypothesis

Ref	Expression
n0ii.1	⊢ 𝐴 ∈ 𝐵

Assertion

Ref	Expression
ne0ii	⊢ 𝐵 ≠ ∅

Proof of Theorem ne0ii

Step	Hyp	Ref	Expression
1		n0ii.1	. 2 ⊢ 𝐴 ∈ 𝐵
2		ne0i 3316	. 2 ⊢ (𝐴 ∈ 𝐵 → 𝐵 ≠ ∅)
3	1, 2	ax-mp 7	1 ⊢ 𝐵 ≠ ∅

Syntax hints:   ∈ wcel 1448   ≠ wne 2267  ∅c0 3310

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-in1 584  ax-in2 585  ax-io 671  ax-5 1391  ax-7 1392  ax-gen 1393  ax-ie1 1437  ax-ie2 1438  ax-8 1450  ax-10 1451  ax-11 1452  ax-i12 1453  ax-bndl 1454  ax-4 1455  ax-17 1474  ax-i9 1478  ax-ial 1482  ax-i5r 1483  ax-ext 2082

This theorem depends on definitions:  df-bi 116  df-tru 1302  df-nf 1405  df-sb 1704  df-clab 2087  df-cleq 2093  df-clel 2096  df-nfc 2229  df-ne 2268  df-v 2643  df-dif 3023  df-nul 3311

This theorem is referenced by: (None)