Theorem bj-tagn0 37231

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 37230	. 2 ⊢ ∅ ∈ tag 𝐴
2	1	ne0ii 4298	1 ⊢ tag 𝐴 ≠ ∅

Syntax hints:   ≠ wne 2933  ∅c0 4287  tag bj-ctag 37226

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-ext 2709  ax-nul 5253

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-tru 1545  df-fal 1555  df-ex 1782  df-sb 2069  df-clab 2716  df-cleq 2729  df-clel 2812  df-ne 2934  df-v 3444  df-dif 3906  df-un 3908  df-nul 4288  df-sn 4583  df-bj-tag 37227

This theorem is referenced by:  bj-1upln0  37261  bj-2upln1upl  37276