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| Mirrors > Home > MPE Home > Th. List > ustne0 | Structured version Visualization version GIF version | ||
| Description: A uniform structure cannot be empty. (Contributed by Thierry Arnoux, 16-Nov-2017.) |
| Ref | Expression |
|---|---|
| ustne0 | ⊢ (𝑈 ∈ (UnifOn‘𝑋) → 𝑈 ≠ ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ustbasel 24143 | . 2 ⊢ (𝑈 ∈ (UnifOn‘𝑋) → (𝑋 × 𝑋) ∈ 𝑈) | |
| 2 | 1 | ne0d 4317 | 1 ⊢ (𝑈 ∈ (UnifOn‘𝑋) → 𝑈 ≠ ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2108 ≠ wne 2932 ∅c0 4308 × cxp 5652 ‘cfv 6530 UnifOncust 24136 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2707 ax-sep 5266 ax-nul 5276 ax-pow 5335 ax-pr 5402 ax-un 7727 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2539 df-eu 2568 df-clab 2714 df-cleq 2727 df-clel 2809 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3061 df-rab 3416 df-v 3461 df-dif 3929 df-un 3931 df-in 3933 df-ss 3943 df-nul 4309 df-if 4501 df-pw 4577 df-sn 4602 df-pr 4604 df-op 4608 df-uni 4884 df-br 5120 df-opab 5182 df-mpt 5202 df-id 5548 df-xp 5660 df-rel 5661 df-cnv 5662 df-co 5663 df-dm 5664 df-res 5666 df-iota 6483 df-fun 6532 df-fv 6538 df-ust 24137 |
| This theorem is referenced by: utopbas 24172 cstucnd 24220 |
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