Theorem ne0d 3502

Description: Deduction form of ne0i 3501. If a class has elements, then it is nonempty. (Contributed by Glauco Siliprandi, 23-Oct-2021.)

Hypothesis

Ref	Expression
ne0d.1	⊢ (𝜑 → 𝐵 ∈ 𝐴)

Assertion

Ref	Expression
ne0d	⊢ (𝜑 → 𝐴 ≠ ∅)

Proof of Theorem ne0d

Step	Hyp	Ref	Expression
1		ne0d.1	. 2 ⊢ (𝜑 → 𝐵 ∈ 𝐴)
2		ne0i 3501	. 2 ⊢ (𝐵 ∈ 𝐴 → 𝐴 ≠ ∅)
3	1, 2	syl 14	1 ⊢ (𝜑 → 𝐴 ≠ ∅)

Syntax hints:   → wi 4   ∈ wcel 2202   ≠ wne 2402  ∅c0 3494

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 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-ext 2213

This theorem depends on definitions:  df-bi 117  df-tru 1400  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-v 2804  df-dif 3202  df-nul 3495

This theorem is referenced by:  fihashelne0d  11058  mndbn0  13513  grpbn0  13612  bln0  15141