Theorem bj-tagn0 36981

Description: The tagging of a class is nonempty. (Contributed by BJ, 6-Apr-2019.)

Assertion

Ref	Expression
bj-tagn0	⊢ tag 𝐴 ≠ ∅

Proof of Theorem bj-tagn0

Step	Hyp	Ref	Expression
1		bj-0eltag 36980	. 2 ⊢ ∅ ∈ tag 𝐴
2	1	ne0ii 4343	1 ⊢ tag 𝐴 ≠ ∅

Syntax hints:   ≠ wne 2939  ∅c0 4332  tag bj-ctag 36976

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1794  ax-4 1808  ax-5 1909  ax-6 1966  ax-7 2006  ax-8 2109  ax-9 2117  ax-ext 2707  ax-nul 5305

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-tru 1542  df-fal 1552  df-ex 1779  df-sb 2064  df-clab 2714  df-cleq 2728  df-clel 2815  df-ne 2940  df-v 3481  df-dif 3953  df-un 3955  df-nul 4333  df-sn 4626  df-bj-tag 36977

This theorem is referenced by:  bj-1upln0  37011  bj-2upln1upl  37026