Theorem ne0ii 3413

Description: If a class has elements, then it is nonempty. Inference associated with ne0i 3410. (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 3410	. 2 ⊢ (𝐴 ∈ 𝐵 → 𝐵 ≠ ∅)
3	1, 2	ax-mp 5	1 ⊢ 𝐵 ≠ ∅

Syntax hints:   ∈ wcel 2135   ≠ wne 2334  ∅c0 3404

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1434  ax-7 1435  ax-gen 1436  ax-ie1 1480  ax-ie2 1481  ax-8 1491  ax-10 1492  ax-11 1493  ax-i12 1494  ax-bndl 1496  ax-4 1497  ax-17 1513  ax-i9 1517  ax-ial 1521  ax-i5r 1522  ax-ext 2146

This theorem depends on definitions:  df-bi 116  df-tru 1345  df-nf 1448  df-sb 1750  df-clab 2151  df-cleq 2157  df-clel 2160  df-nfc 2295  df-ne 2335  df-v 2723  df-dif 3113  df-nul 3405

This theorem is referenced by:  pw1ne0  7175  sucpw1nel3  7180