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| Mirrors > Home > MPE Home > Th. List > ixxex | Structured version Visualization version GIF version | ||
| Description: The set of intervals of extended reals exists. (Contributed by Mario Carneiro, 3-Nov-2013.) (Revised by Mario Carneiro, 17-Nov-2014.) |
| Ref | Expression |
|---|---|
| ixx.1 | ⊢ 𝑂 = (𝑥 ∈ ℝ*, 𝑦 ∈ ℝ* ↦ {𝑧 ∈ ℝ* ∣ (𝑥𝑅𝑧 ∧ 𝑧𝑆𝑦)}) |
| Ref | Expression |
|---|---|
| ixxex | ⊢ 𝑂 ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | xrex 13017 | . . . 4 ⊢ ℝ* ∈ V | |
| 2 | 1, 1 | xpex 7750 | . . 3 ⊢ (ℝ* × ℝ*) ∈ V |
| 3 | 1 | pwex 5350 | . . 3 ⊢ 𝒫 ℝ* ∈ V |
| 4 | 2, 3 | xpex 7750 | . 2 ⊢ ((ℝ* × ℝ*) × 𝒫 ℝ*) ∈ V |
| 5 | ixx.1 | . . . 4 ⊢ 𝑂 = (𝑥 ∈ ℝ*, 𝑦 ∈ ℝ* ↦ {𝑧 ∈ ℝ* ∣ (𝑥𝑅𝑧 ∧ 𝑧𝑆𝑦)}) | |
| 6 | 5 | ixxf 13388 | . . 3 ⊢ 𝑂:(ℝ* × ℝ*)⟶𝒫 ℝ* |
| 7 | fssxp 6733 | . . 3 ⊢ (𝑂:(ℝ* × ℝ*)⟶𝒫 ℝ* → 𝑂 ⊆ ((ℝ* × ℝ*) × 𝒫 ℝ*)) | |
| 8 | 6, 7 | ax-mp 5 | . 2 ⊢ 𝑂 ⊆ ((ℝ* × ℝ*) × 𝒫 ℝ*) |
| 9 | 4, 8 | ssexi 5292 | 1 ⊢ 𝑂 ∈ V |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∧ wa 400 = wceq 1569 ∈ wcel 2142 {crab 3415 Vcvv 3454 ⊆ wss 3904 𝒫 cpw 4561 class class class wbr 5108 × cxp 5658 ⟶wf 6532 ∈ cmpo 7414 ℝ*cxr 11248 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1824 ax-4 1838 ax-5 1939 ax-6 1996 ax-7 2037 ax-8 2144 ax-9 2152 ax-10 2175 ax-11 2191 ax-12 2212 ax-ext 2734 ax-sep 5256 ax-nul 5268 ax-pow 5335 ax-pr 5403 ax-un 7734 ax-cnex 11162 ax-resscn 11163 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1104 df-tru 1572 df-fal 1582 df-ex 1809 df-nf 1813 df-sb 2096 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-ral 3079 df-rex 3089 df-rab 3416 df-v 3456 df-sbc 3744 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-nul 4286 df-if 4487 df-pw 4563 df-sn 4589 df-pr 4591 df-op 4595 df-uni 4872 df-iun 4957 df-br 5109 df-opab 5173 df-mpt 5192 df-id 5555 df-xp 5666 df-rel 5667 df-cnv 5668 df-co 5669 df-dm 5670 df-rn 5671 df-res 5672 df-ima 5673 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-fv 6544 df-oprab 7416 df-mpo 7417 df-1st 7984 df-2nd 7985 df-xr 11253 |
| This theorem is used by: iooex 13401 isbasisrelowl 38032 relowlpssretop 38038 |
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