Theorem ne0ii 3424

Description: If a class has elements, then it is nonempty. Inference associated with ne0i 3421. (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 3421	. 2 ⊢ (𝐴 ∈ 𝐵 → 𝐵 ≠ ∅)
3	1, 2	ax-mp 5	1 ⊢ 𝐵 ≠ ∅

Syntax hints:   ∈ wcel 2141   ≠ wne 2340  ∅c0 3414

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 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-ext 2152

This theorem depends on definitions:  df-bi 116  df-tru 1351  df-nf 1454  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ne 2341  df-v 2732  df-dif 3123  df-nul 3415

This theorem is referenced by:  pw1ne0  7205  sucpw1nel3  7210