Theorem ne0d 3454

Description: Deduction form of ne0i 3453. If a class has elements, then it is nonempty. (Contributed by Glauco Siliprandi, 23-Oct-2021.)

Hypothesis

Ref	Expression
ne0d.1	|- ( ph -> B e. A )

Assertion

Ref	Expression
ne0d	|- ( ph -> A =/= (/) )

Proof of Theorem ne0d

Step	Hyp	Ref	Expression
1		ne0d.1	. 2 |- ( ph -> B e. A )
2		ne0i 3453	. 2 |- ( B e. A -> A =/= (/) )
3	1, 2	syl 14	1 |- ( ph -> A =/= (/) )

Syntax hints:   -> wi 4   e. wcel 2164   =/= wne 2364   (/)c0 3446

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 615  ax-in2 616  ax-io 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-ext 2175

This theorem depends on definitions:  df-bi 117  df-tru 1367  df-nf 1472  df-sb 1774  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ne 2365  df-v 2762  df-dif 3155  df-nul 3447

This theorem is referenced by:  fihashelne0d  10858  mndbn0  13002  grpbn0  13092  bln0  14563