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Theorem ustne0 24352
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 24345 . 2 (𝑈 ∈ (UnifOn‘𝑋) → (𝑋 × 𝑋) ∈ 𝑈)
21ne0d 4296 1 (𝑈 ∈ (UnifOn‘𝑋) → 𝑈 ≠ ∅)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wcel 2143  wne 2958  c0 4287   × cxp 5661  cfv 6538  UnifOncust 24338
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-sep 5258  ax-nul 5270  ax-pow 5338  ax-pr 5406  ax-un 7734
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4288  df-if 4489  df-pw 4565  df-sn 4591  df-pr 4593  df-op 4597  df-uni 4874  df-br 5111  df-opab 5175  df-mpt 5194  df-id 5558  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-res 5675  df-iota 6494  df-fun 6540  df-fv 6546  df-ust 24339
This theorem is referenced by:  utopbas  24373  cstucnd  24421
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