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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 13396 | . . 3 ⊢ (𝐴(,)𝐵) ∈ ran (,) | |
| 2 | ioorf.1 | . . . 4 ⊢ 𝐹 = (𝑥 ∈ ran (,) ↦ if(𝑥 = ∅, 〈0, 0〉, 〈inf(𝑥, ℝ*, < ), sup(𝑥, ℝ*, < )〉)) | |
| 3 | 2 | ioorval 25560 | . . 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 4467 | . . 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 4282 | . . . . . . 7 ⊢ ((𝐴(,)𝐵) ≠ ∅ ↔ ∃𝑥 𝑥 ∈ (𝐴(,)𝐵)) | |
| 7 | eliooxr 13349 | . . . . . . . 8 ⊢ (𝑥 ∈ (𝐴(,)𝐵) → (𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*)) | |
| 8 | 7 | exlimiv 1937 | . . . . . . 7 ⊢ (∃𝑥 𝑥 ∈ (𝐴(,)𝐵) → (𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*)) |
| 9 | 6, 8 | sylbi 218 | . . . . . 6 ⊢ ((𝐴(,)𝐵) ≠ ∅ → (𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*)) |
| 10 | 9 | simpld 495 | . . . . 5 ⊢ ((𝐴(,)𝐵) ≠ ∅ → 𝐴 ∈ ℝ*) |
| 11 | 9 | simprd 496 | . . . . 5 ⊢ ((𝐴(,)𝐵) ≠ ∅ → 𝐵 ∈ ℝ*) |
| 12 | id 22 | . . . . 5 ⊢ ((𝐴(,)𝐵) ≠ ∅ → (𝐴(,)𝐵) ≠ ∅) | |
| 13 | df-ioo 13294 | . . . . . 6 ⊢ (,) = (𝑥 ∈ ℝ*, 𝑦 ∈ ℝ* ↦ {𝑧 ∈ ℝ* ∣ (𝑥 < 𝑧 ∧ 𝑧 < 𝑦)}) | |
| 14 | idd 24 | . . . . . 6 ⊢ ((𝑤 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝑤 < 𝐵 → 𝑤 < 𝐵)) | |
| 15 | xrltle 13092 | . . . . . 6 ⊢ ((𝑤 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝑤 < 𝐵 → 𝑤 ≤ 𝐵)) | |
| 16 | idd 24 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ* ∧ 𝑤 ∈ ℝ*) → (𝐴 < 𝑤 → 𝐴 < 𝑤)) | |
| 17 | xrltle 13092 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ* ∧ 𝑤 ∈ ℝ*) → (𝐴 < 𝑤 → 𝐴 ≤ 𝑤)) | |
| 18 | 13, 14, 15, 16, 17 | ixxlb 13312 | . . . . 5 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ (𝐴(,)𝐵) ≠ ∅) → inf((𝐴(,)𝐵), ℝ*, < ) = 𝐴) |
| 19 | 10, 11, 12, 18 | syl3anc 1379 | . . . 4 ⊢ ((𝐴(,)𝐵) ≠ ∅ → inf((𝐴(,)𝐵), ℝ*, < ) = 𝐴) |
| 20 | 13, 14, 15, 16, 17 | ixxub 13311 | . . . . 5 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ (𝐴(,)𝐵) ≠ ∅) → sup((𝐴(,)𝐵), ℝ*, < ) = 𝐵) |
| 21 | 10, 11, 12, 20 | syl3anc 1379 | . . . 4 ⊢ ((𝐴(,)𝐵) ≠ ∅ → sup((𝐴(,)𝐵), ℝ*, < ) = 𝐵) |
| 22 | 19, 21 | opeq12d 4813 | . . 3 ⊢ ((𝐴(,)𝐵) ≠ ∅ → 〈inf((𝐴(,)𝐵), ℝ*, < ), sup((𝐴(,)𝐵), ℝ*, < )〉 = 〈𝐴, 𝐵〉) |
| 23 | 5, 22 | eqtrd 2774 | . 2 ⊢ ((𝐴(,)𝐵) ≠ ∅ → if((𝐴(,)𝐵) = ∅, 〈0, 0〉, 〈inf((𝐴(,)𝐵), ℝ*, < ), sup((𝐴(,)𝐵), ℝ*, < )〉) = 〈𝐴, 𝐵〉) |
| 24 | 4, 23 | eqtrid 2786 | 1 ⊢ ((𝐴(,)𝐵) ≠ ∅ → (𝐹‘(𝐴(,)𝐵)) = 〈𝐴, 𝐵〉) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 396 = wceq 1547 ∃wex 1786 ∈ wcel 2119 ≠ wne 2934 ∅c0 4262 ifcif 4455 〈cop 4562 class class class wbr 5073 ↦ cmpt 5154 ran crn 5620 ‘cfv 6486 (class class class)co 7357 supcsup 9344 infcinf 9345 0cc0 11030 ℝ*cxr 11170 < clt 11171 (,)cioo 13290 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2711 ax-sep 5219 ax-nul 5229 ax-pow 5295 ax-pr 5363 ax-un 7679 ax-cnex 11086 ax-resscn 11087 ax-1cn 11088 ax-icn 11089 ax-addcl 11090 ax-addrcl 11091 ax-mulcl 11092 ax-mulrcl 11093 ax-mulcom 11094 ax-addass 11095 ax-mulass 11096 ax-distr 11097 ax-i2m1 11098 ax-1ne0 11099 ax-1rid 11100 ax-rnegex 11101 ax-rrecex 11102 ax-cnre 11103 ax-pre-lttri 11104 ax-pre-lttrn 11105 ax-pre-ltadd 11106 ax-pre-mulgt0 11107 ax-pre-sup 11108 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2718 df-cleq 2731 df-clel 2814 df-nfc 2888 df-ne 2935 df-nel 3039 df-ral 3054 df-rex 3064 df-rmo 3344 df-reu 3345 df-rab 3392 df-v 3433 df-sbc 3724 df-csb 3832 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3903 df-nul 4263 df-if 4456 df-pw 4532 df-sn 4557 df-pr 4559 df-op 4563 df-uni 4840 df-iun 4924 df-br 5074 df-opab 5136 df-mpt 5155 df-tr 5181 df-id 5514 df-eprel 5519 df-po 5527 df-so 5528 df-fr 5572 df-we 5574 df-xp 5625 df-rel 5626 df-cnv 5627 df-co 5628 df-dm 5629 df-rn 5630 df-res 5631 df-ima 5632 df-pred 6253 df-ord 6314 df-on 6315 df-lim 6316 df-suc 6317 df-iota 6442 df-fun 6488 df-fn 6489 df-f 6490 df-f1 6491 df-fo 6492 df-f1o 6493 df-fv 6494 df-riota 7314 df-ov 7360 df-oprab 7361 df-mpo 7362 df-om 7808 df-1st 7932 df-2nd 7933 df-frecs 8222 df-wrecs 8253 df-recs 8302 df-rdg 8340 df-er 8634 df-en 8885 df-dom 8886 df-sdom 8887 df-sup 9346 df-inf 9347 df-pnf 11173 df-mnf 11174 df-xr 11175 df-ltxr 11176 df-le 11177 df-sub 11371 df-neg 11372 df-div 11800 df-nn 12167 df-n0 12430 df-z 12517 df-uz 12781 df-q 12891 df-ioo 13294 |
| This theorem is referenced by: ioorinv 25562 ioorcl 25563 |
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