Theorem ne0ii 3434

Description: If a class has elements, then it is nonempty. Inference associated with ne0i 3431. (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 3431	. 2 |- ( A e. B -> B =/= (/) )
3	1, 2	ax-mp 5	1 |- B =/= (/)

Syntax hints:   e. wcel 2148   =/= wne 2347   (/)c0 3424

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 614  ax-in2 615  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-ext 2159

This theorem depends on definitions:  df-bi 117  df-tru 1356  df-nf 1461  df-sb 1763  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ne 2348  df-v 2741  df-dif 3133  df-nul 3425

This theorem is referenced by:  pw1ne0  7230  sucpw1nel3  7235