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| Mirrors > Home > MPE Home > Th. List > ustrel | Structured version Visualization version GIF version | ||
| Description: The elements of uniform structures, called entourages, are relations. (Contributed by Thierry Arnoux, 15-Nov-2017.) |
| Ref | Expression |
|---|---|
| ustrel | ⊢ ((𝑈 ∈ (UnifOn‘𝑋) ∧ 𝑉 ∈ 𝑈) → Rel 𝑉) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ustssxp 24529 | . . 3 ⊢ ((𝑈 ∈ (UnifOn‘𝑋) ∧ 𝑉 ∈ 𝑈) → 𝑉 ⊆ (𝑋 × 𝑋)) | |
| 2 | xpss 5666 | . . 3 ⊢ (𝑋 × 𝑋) ⊆ (V × V) | |
| 3 | 1, 2 | sstrdi 3920 | . 2 ⊢ ((𝑈 ∈ (UnifOn‘𝑋) ∧ 𝑉 ∈ 𝑈) → 𝑉 ⊆ (V × V)) |
| 4 | df-rel 5657 | . 2 ⊢ (Rel 𝑉 ↔ 𝑉 ⊆ (V × V)) | |
| 5 | 3, 4 | sylibr 237 | 1 ⊢ ((𝑈 ∈ (UnifOn‘𝑋) ∧ 𝑉 ∈ 𝑈) → Rel 𝑉) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∈ wcel 2144 Vcvv 3450 ⊆ wss 3895 × cxp 5648 Rel wrel 5655 ‘cfv 6538 UnifOncust 24524 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7751 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-ss 3896 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-opab 5167 df-mpt 5186 df-id 5545 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-res 5662 df-iota 6494 df-fun 6540 df-fv 6546 df-ust 24525 |
| This theorem is used by: ustssco 24539 ustexsym 24540 ustuqtop4 24568 utop2nei 24574 utop3cls 24575 ucncn 24608 |
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