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Theorem ustne0 22919
Description: A uniform structure cannot be empty. (Contributed by Thierry Arnoux, 16-Nov-2017.)
Assertion
Ref Expression
ustne0 (𝑈 ∈ (UnifOn‘𝑋) → 𝑈 ≠ ∅)

Proof of Theorem ustne0
StepHypRef Expression
1 ustbasel 22912 . 2 (𝑈 ∈ (UnifOn‘𝑋) → (𝑋 × 𝑋) ∈ 𝑈)
21ne0d 4236 1 (𝑈 ∈ (UnifOn‘𝑋) → 𝑈 ≠ ∅)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wcel 2111  wne 2951  c0 4227   × cxp 5525  cfv 6339  UnifOncust 22905
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 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2729  ax-sep 5172  ax-nul 5179  ax-pow 5237  ax-pr 5301  ax-un 7464
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2557  df-eu 2588  df-clab 2736  df-cleq 2750  df-clel 2830  df-nfc 2901  df-ne 2952  df-ral 3075  df-rex 3076  df-rab 3079  df-v 3411  df-sbc 3699  df-dif 3863  df-un 3865  df-in 3867  df-ss 3877  df-nul 4228  df-if 4424  df-pw 4499  df-sn 4526  df-pr 4528  df-op 4532  df-uni 4802  df-br 5036  df-opab 5098  df-mpt 5116  df-id 5433  df-xp 5533  df-rel 5534  df-cnv 5535  df-co 5536  df-dm 5537  df-res 5539  df-iota 6298  df-fun 6341  df-fv 6347  df-ust 22906
This theorem is referenced by:  utopbas  22941  cstucnd  22990
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