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| Mirrors > Home > MPE Home > Th. List > ioorinv2 | Structured version Visualization version GIF version | ||
| Description: The function 𝐹 is an "inverse" of sorts to the open interval function. (Contributed by Mario Carneiro, 26-Mar-2015.) (Revised by AV, 13-Sep-2020.) |
| Ref | Expression |
|---|---|
| ioorf.1 | ⊢ 𝐹 = (𝑥 ∈ ran (,) ↦ if(𝑥 = ∅, 〈0, 0〉, 〈inf(𝑥, ℝ*, < ), sup(𝑥, ℝ*, < )〉)) |
| Ref | Expression |
|---|---|
| ioorinv2 | ⊢ ((𝐴(,)𝐵) ≠ ∅ → (𝐹‘(𝐴(,)𝐵)) = 〈𝐴, 𝐵〉) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ioorebas 13479 | . . 3 ⊢ (𝐴(,)𝐵) ∈ ran (,) | |
| 2 | ioorf.1 | . . . 4 ⊢ 𝐹 = (𝑥 ∈ ran (,) ↦ if(𝑥 = ∅, 〈0, 0〉, 〈inf(𝑥, ℝ*, < ), sup(𝑥, ℝ*, < )〉)) | |
| 3 | 2 | ioorval 25714 | . . 3 ⊢ ((𝐴(,)𝐵) ∈ ran (,) → (𝐹‘(𝐴(,)𝐵)) = if((𝐴(,)𝐵) = ∅, 〈0, 0〉, 〈inf((𝐴(,)𝐵), ℝ*, < ), sup((𝐴(,)𝐵), ℝ*, < )〉)) |
| 4 | 1, 3 | ax-mp 5 | . 2 ⊢ (𝐹‘(𝐴(,)𝐵)) = if((𝐴(,)𝐵) = ∅, 〈0, 0〉, 〈inf((𝐴(,)𝐵), ℝ*, < ), sup((𝐴(,)𝐵), ℝ*, < )〉) |
| 5 | ifnefalse 4500 | . . 3 ⊢ ((𝐴(,)𝐵) ≠ ∅ → if((𝐴(,)𝐵) = ∅, 〈0, 0〉, 〈inf((𝐴(,)𝐵), ℝ*, < ), sup((𝐴(,)𝐵), ℝ*, < )〉) = 〈inf((𝐴(,)𝐵), ℝ*, < ), sup((𝐴(,)𝐵), ℝ*, < )〉) | |
| 6 | n0 4308 | . . . . . . 7 ⊢ ((𝐴(,)𝐵) ≠ ∅ ↔ ∃𝑥 𝑥 ∈ (𝐴(,)𝐵)) | |
| 7 | eliooxr 13432 | . . . . . . . 8 ⊢ (𝑥 ∈ (𝐴(,)𝐵) → (𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*)) | |
| 8 | 7 | exlimiv 1960 | . . . . . . 7 ⊢ (∃𝑥 𝑥 ∈ (𝐴(,)𝐵) → (𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*)) |
| 9 | 6, 8 | sylbi 220 | . . . . . 6 ⊢ ((𝐴(,)𝐵) ≠ ∅ → (𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*)) |
| 10 | 9 | simpld 499 | . . . . 5 ⊢ ((𝐴(,)𝐵) ≠ ∅ → 𝐴 ∈ ℝ*) |
| 11 | 9 | simprd 500 | . . . . 5 ⊢ ((𝐴(,)𝐵) ≠ ∅ → 𝐵 ∈ ℝ*) |
| 12 | id 23 | . . . . 5 ⊢ ((𝐴(,)𝐵) ≠ ∅ → (𝐴(,)𝐵) ≠ ∅) | |
| 13 | df-ioo 13377 | . . . . . 6 ⊢ (,) = (𝑥 ∈ ℝ*, 𝑦 ∈ ℝ* ↦ {𝑧 ∈ ℝ* ∣ (𝑥 < 𝑧 ∧ 𝑧 < 𝑦)}) | |
| 14 | idd 25 | . . . . . 6 ⊢ ((𝑤 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝑤 < 𝐵 → 𝑤 < 𝐵)) | |
| 15 | xrltle 13175 | . . . . . 6 ⊢ ((𝑤 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝑤 < 𝐵 → 𝑤 ≤ 𝐵)) | |
| 16 | idd 25 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ* ∧ 𝑤 ∈ ℝ*) → (𝐴 < 𝑤 → 𝐴 < 𝑤)) | |
| 17 | xrltle 13175 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ* ∧ 𝑤 ∈ ℝ*) → (𝐴 < 𝑤 → 𝐴 ≤ 𝑤)) | |
| 18 | 13, 14, 15, 16, 17 | ixxlb 13395 | . . . . 5 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ (𝐴(,)𝐵) ≠ ∅) → inf((𝐴(,)𝐵), ℝ*, < ) = 𝐴) |
| 19 | 10, 11, 12, 18 | syl3anc 1398 | . . . 4 ⊢ ((𝐴(,)𝐵) ≠ ∅ → inf((𝐴(,)𝐵), ℝ*, < ) = 𝐴) |
| 20 | 13, 14, 15, 16, 17 | ixxub 13394 | . . . . 5 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ (𝐴(,)𝐵) ≠ ∅) → sup((𝐴(,)𝐵), ℝ*, < ) = 𝐵) |
| 21 | 10, 11, 12, 20 | syl3anc 1398 | . . . 4 ⊢ ((𝐴(,)𝐵) ≠ ∅ → sup((𝐴(,)𝐵), ℝ*, < ) = 𝐵) |
| 22 | 19, 21 | opeq12d 4847 | . . 3 ⊢ ((𝐴(,)𝐵) ≠ ∅ → 〈inf((𝐴(,)𝐵), ℝ*, < ), sup((𝐴(,)𝐵), ℝ*, < )〉 = 〈𝐴, 𝐵〉) |
| 23 | 5, 22 | eqtrd 2798 | . 2 ⊢ ((𝐴(,)𝐵) ≠ ∅ → if((𝐴(,)𝐵) = ∅, 〈0, 0〉, 〈inf((𝐴(,)𝐵), ℝ*, < ), sup((𝐴(,)𝐵), ℝ*, < )〉) = 〈𝐴, 𝐵〉) |
| 24 | 4, 23 | eqtrid 2810 | 1 ⊢ ((𝐴(,)𝐵) ≠ ∅ → (𝐹‘(𝐴(,)𝐵)) = 〈𝐴, 𝐵〉) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 = wceq 1570 ∃wex 1809 ∈ wcel 2143 ≠ wne 2958 ∅c0 4287 ifcif 4488 〈cop 4596 class class class wbr 5110 ↦ cmpt 5193 ran crn 5664 ‘cfv 6538 (class class class)co 7412 supcsup 9401 infcinf 9402 0cc0 11101 ℝ*cxr 11243 < clt 11244 (,)cioo 13373 |
| 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 ax-cnex 11157 ax-resscn 11158 ax-1cn 11159 ax-icn 11160 ax-addcl 11161 ax-addrcl 11162 ax-mulcl 11163 ax-mulrcl 11164 ax-mulcom 11165 ax-addass 11166 ax-mulass 11167 ax-distr 11168 ax-i2m1 11169 ax-1ne0 11170 ax-1rid 11171 ax-rnegex 11172 ax-rrecex 11173 ax-cnre 11174 ax-pre-lttri 11175 ax-pre-lttrn 11176 ax-pre-ltadd 11177 ax-pre-mulgt0 11178 ax-pre-sup 11179 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1104 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-nel 3065 df-ral 3080 df-rex 3090 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3457 df-sbc 3746 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4288 df-if 4489 df-pw 4565 df-sn 4591 df-pr 4593 df-op 4597 df-uni 4874 df-iun 4959 df-br 5111 df-opab 5175 df-mpt 5194 df-tr 5220 df-id 5558 df-eprel 5563 df-po 5571 df-so 5572 df-fr 5616 df-we 5618 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7864 df-1st 7987 df-2nd 7988 df-frecs 8279 df-wrecs 8310 df-recs 8359 df-rdg 8398 df-er 8695 df-en 8945 df-dom 8946 df-sdom 8947 df-sup 9403 df-inf 9404 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11444 df-neg 11445 df-div 11873 df-nn 12235 df-n0 12506 df-z 12593 df-uz 12864 df-q 12974 df-ioo 13377 |
| This theorem is referenced by: ioorinv 25716 ioorcl 25717 |
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