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| Mirrors > Home > MPE Home > Th. List > Mathboxes > icoreelrnab | Structured version Visualization version GIF version | ||
| Description: Elementhood in the set of closed-below, open-above intervals of reals. (Contributed by ML, 27-Jul-2020.) |
| Ref | Expression |
|---|---|
| icoreelrnab.1 | ⊢ 𝐼 = ([,) “ (ℝ × ℝ)) |
| Ref | Expression |
|---|---|
| icoreelrnab | ⊢ (𝑋 ∈ 𝐼 ↔ ∃𝑎 ∈ ℝ ∃𝑏 ∈ ℝ 𝑋 = {𝑧 ∈ ℝ ∣ (𝑎 ≤ 𝑧 ∧ 𝑧 < 𝑏)}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | icoreelrnab.1 | . . . . . 6 ⊢ 𝐼 = ([,) “ (ℝ × ℝ)) | |
| 2 | df-ima 5629 | . . . . . 6 ⊢ ([,) “ (ℝ × ℝ)) = ran ([,) ↾ (ℝ × ℝ)) | |
| 3 | 1, 2 | eqtri 2754 | . . . . 5 ⊢ 𝐼 = ran ([,) ↾ (ℝ × ℝ)) |
| 4 | 3 | eleq2i 2823 | . . . 4 ⊢ (𝑋 ∈ 𝐼 ↔ 𝑋 ∈ ran ([,) ↾ (ℝ × ℝ))) |
| 5 | icoreresf 37385 | . . . . 5 ⊢ ([,) ↾ (ℝ × ℝ)):(ℝ × ℝ)⟶𝒫 ℝ | |
| 6 | ffn 6651 | . . . . 5 ⊢ (([,) ↾ (ℝ × ℝ)):(ℝ × ℝ)⟶𝒫 ℝ → ([,) ↾ (ℝ × ℝ)) Fn (ℝ × ℝ)) | |
| 7 | ovelrn 7522 | . . . . 5 ⊢ (([,) ↾ (ℝ × ℝ)) Fn (ℝ × ℝ) → (𝑋 ∈ ran ([,) ↾ (ℝ × ℝ)) ↔ ∃𝑎 ∈ ℝ ∃𝑏 ∈ ℝ 𝑋 = (𝑎([,) ↾ (ℝ × ℝ))𝑏))) | |
| 8 | 5, 6, 7 | mp2b 10 | . . . 4 ⊢ (𝑋 ∈ ran ([,) ↾ (ℝ × ℝ)) ↔ ∃𝑎 ∈ ℝ ∃𝑏 ∈ ℝ 𝑋 = (𝑎([,) ↾ (ℝ × ℝ))𝑏)) |
| 9 | 4, 8 | bitri 275 | . . 3 ⊢ (𝑋 ∈ 𝐼 ↔ ∃𝑎 ∈ ℝ ∃𝑏 ∈ ℝ 𝑋 = (𝑎([,) ↾ (ℝ × ℝ))𝑏)) |
| 10 | ovres 7512 | . . . . 5 ⊢ ((𝑎 ∈ ℝ ∧ 𝑏 ∈ ℝ) → (𝑎([,) ↾ (ℝ × ℝ))𝑏) = (𝑎[,)𝑏)) | |
| 11 | 10 | eqeq2d 2742 | . . . 4 ⊢ ((𝑎 ∈ ℝ ∧ 𝑏 ∈ ℝ) → (𝑋 = (𝑎([,) ↾ (ℝ × ℝ))𝑏) ↔ 𝑋 = (𝑎[,)𝑏))) |
| 12 | 11 | 2rexbiia 3193 | . . 3 ⊢ (∃𝑎 ∈ ℝ ∃𝑏 ∈ ℝ 𝑋 = (𝑎([,) ↾ (ℝ × ℝ))𝑏) ↔ ∃𝑎 ∈ ℝ ∃𝑏 ∈ ℝ 𝑋 = (𝑎[,)𝑏)) |
| 13 | 9, 12 | bitri 275 | . 2 ⊢ (𝑋 ∈ 𝐼 ↔ ∃𝑎 ∈ ℝ ∃𝑏 ∈ ℝ 𝑋 = (𝑎[,)𝑏)) |
| 14 | icoreval 37386 | . . . 4 ⊢ ((𝑎 ∈ ℝ ∧ 𝑏 ∈ ℝ) → (𝑎[,)𝑏) = {𝑧 ∈ ℝ ∣ (𝑎 ≤ 𝑧 ∧ 𝑧 < 𝑏)}) | |
| 15 | 14 | eqeq2d 2742 | . . 3 ⊢ ((𝑎 ∈ ℝ ∧ 𝑏 ∈ ℝ) → (𝑋 = (𝑎[,)𝑏) ↔ 𝑋 = {𝑧 ∈ ℝ ∣ (𝑎 ≤ 𝑧 ∧ 𝑧 < 𝑏)})) |
| 16 | 15 | 2rexbiia 3193 | . 2 ⊢ (∃𝑎 ∈ ℝ ∃𝑏 ∈ ℝ 𝑋 = (𝑎[,)𝑏) ↔ ∃𝑎 ∈ ℝ ∃𝑏 ∈ ℝ 𝑋 = {𝑧 ∈ ℝ ∣ (𝑎 ≤ 𝑧 ∧ 𝑧 < 𝑏)}) |
| 17 | 13, 16 | bitri 275 | 1 ⊢ (𝑋 ∈ 𝐼 ↔ ∃𝑎 ∈ ℝ ∃𝑏 ∈ ℝ 𝑋 = {𝑧 ∈ ℝ ∣ (𝑎 ≤ 𝑧 ∧ 𝑧 < 𝑏)}) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 ∧ wa 395 = wceq 1541 ∈ wcel 2111 ∃wrex 3056 {crab 3395 𝒫 cpw 4550 class class class wbr 5091 × cxp 5614 ran crn 5617 ↾ cres 5618 “ cima 5619 Fn wfn 6476 ⟶wf 6477 (class class class)co 7346 ℝcr 11002 < clt 11143 ≤ cle 11144 [,)cico 13244 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-sep 5234 ax-nul 5244 ax-pow 5303 ax-pr 5370 ax-un 7668 ax-cnex 11059 ax-resscn 11060 ax-pre-lttri 11077 ax-pre-lttrn 11078 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-rab 3396 df-v 3438 df-sbc 3742 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4284 df-if 4476 df-pw 4552 df-sn 4577 df-pr 4579 df-op 4583 df-uni 4860 df-iun 4943 df-br 5092 df-opab 5154 df-mpt 5173 df-id 5511 df-po 5524 df-so 5525 df-xp 5622 df-rel 5623 df-cnv 5624 df-co 5625 df-dm 5626 df-rn 5627 df-res 5628 df-ima 5629 df-iota 6437 df-fun 6483 df-fn 6484 df-f 6485 df-f1 6486 df-fo 6487 df-f1o 6488 df-fv 6489 df-ov 7349 df-oprab 7350 df-mpo 7351 df-1st 7921 df-2nd 7922 df-er 8622 df-en 8870 df-dom 8871 df-sdom 8872 df-pnf 11145 df-mnf 11146 df-xr 11147 df-ltxr 11148 df-le 11149 df-ico 13248 |
| This theorem is referenced by: isbasisrelowllem1 37388 isbasisrelowllem2 37389 icoreclin 37390 |
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