Theorem ne0ii 3446

Description: If a class has elements, then it is nonempty. Inference associated with ne0i 3443. (Contributed by Glauco Siliprandi, 11-Dec-2019.)

Hypothesis

Ref	Expression
n0ii.1	|- A e. B

Assertion

Ref	Expression
ne0ii	|- B =/= (/)

Proof of Theorem ne0ii

Step	Hyp	Ref	Expression
1		n0ii.1	. 2 |- A e. B
2		ne0i 3443	. 2 |- ( A e. B -> B =/= (/) )
3	1, 2	ax-mp 5	1 |- B =/= (/)

Syntax hints:   e. wcel 2159   =/= wne 2359   (/)c0 3436

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 1457  ax-7 1458  ax-gen 1459  ax-ie1 1503  ax-ie2 1504  ax-8 1514  ax-10 1515  ax-11 1516  ax-i12 1517  ax-bndl 1519  ax-4 1520  ax-17 1536  ax-i9 1540  ax-ial 1544  ax-i5r 1545  ax-ext 2170

This theorem depends on definitions:  df-bi 117  df-tru 1366  df-nf 1471  df-sb 1773  df-clab 2175  df-cleq 2181  df-clel 2184  df-nfc 2320  df-ne 2360  df-v 2753  df-dif 3145  df-nul 3437

This theorem is referenced by:  pw1ne0  7244  sucpw1nel3  7249