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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 5633 | . . . . . 6 ⊢ ([,) “ (ℝ × ℝ)) = ran ([,) ↾ (ℝ × ℝ)) | |
| 3 | 1, 2 | eqtri 2764 | . . . . 5 ⊢ 𝐼 = ran ([,) ↾ (ℝ × ℝ)) |
| 4 | 3 | eleq2i 2833 | . . . 4 ⊢ (𝑋 ∈ 𝐼 ↔ 𝑋 ∈ ran ([,) ↾ (ℝ × ℝ))) |
| 5 | icoreresf 37727 | . . . . 5 ⊢ ([,) ↾ (ℝ × ℝ)):(ℝ × ℝ)⟶𝒫 ℝ | |
| 6 | ffn 6658 | . . . . 5 ⊢ (([,) ↾ (ℝ × ℝ)):(ℝ × ℝ)⟶𝒫 ℝ → ([,) ↾ (ℝ × ℝ)) Fn (ℝ × ℝ)) | |
| 7 | ovelrn 7535 | . . . . 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 277 | . . 3 ⊢ (𝑋 ∈ 𝐼 ↔ ∃𝑎 ∈ ℝ ∃𝑏 ∈ ℝ 𝑋 = (𝑎([,) ↾ (ℝ × ℝ))𝑏)) |
| 10 | ovres 7525 | . . . . 5 ⊢ ((𝑎 ∈ ℝ ∧ 𝑏 ∈ ℝ) → (𝑎([,) ↾ (ℝ × ℝ))𝑏) = (𝑎[,)𝑏)) | |
| 11 | 10 | eqeq2d 2752 | . . . 4 ⊢ ((𝑎 ∈ ℝ ∧ 𝑏 ∈ ℝ) → (𝑋 = (𝑎([,) ↾ (ℝ × ℝ))𝑏) ↔ 𝑋 = (𝑎[,)𝑏))) |
| 12 | 11 | 2rexbiia 3202 | . . 3 ⊢ (∃𝑎 ∈ ℝ ∃𝑏 ∈ ℝ 𝑋 = (𝑎([,) ↾ (ℝ × ℝ))𝑏) ↔ ∃𝑎 ∈ ℝ ∃𝑏 ∈ ℝ 𝑋 = (𝑎[,)𝑏)) |
| 13 | 9, 12 | bitri 277 | . 2 ⊢ (𝑋 ∈ 𝐼 ↔ ∃𝑎 ∈ ℝ ∃𝑏 ∈ ℝ 𝑋 = (𝑎[,)𝑏)) |
| 14 | icoreval 37728 | . . . 4 ⊢ ((𝑎 ∈ ℝ ∧ 𝑏 ∈ ℝ) → (𝑎[,)𝑏) = {𝑧 ∈ ℝ ∣ (𝑎 ≤ 𝑧 ∧ 𝑧 < 𝑏)}) | |
| 15 | 14 | eqeq2d 2752 | . . 3 ⊢ ((𝑎 ∈ ℝ ∧ 𝑏 ∈ ℝ) → (𝑋 = (𝑎[,)𝑏) ↔ 𝑋 = {𝑧 ∈ ℝ ∣ (𝑎 ≤ 𝑧 ∧ 𝑧 < 𝑏)})) |
| 16 | 15 | 2rexbiia 3202 | . 2 ⊢ (∃𝑎 ∈ ℝ ∃𝑏 ∈ ℝ 𝑋 = (𝑎[,)𝑏) ↔ ∃𝑎 ∈ ℝ ∃𝑏 ∈ ℝ 𝑋 = {𝑧 ∈ ℝ ∣ (𝑎 ≤ 𝑧 ∧ 𝑧 < 𝑏)}) |
| 17 | 13, 16 | bitri 277 | 1 ⊢ (𝑋 ∈ 𝐼 ↔ ∃𝑎 ∈ ℝ ∃𝑏 ∈ ℝ 𝑋 = {𝑧 ∈ ℝ ∣ (𝑎 ≤ 𝑧 ∧ 𝑧 < 𝑏)}) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 208 ∧ wa 397 = wceq 1548 ∈ wcel 2121 ∃wrex 3065 {crab 3393 𝒫 cpw 4531 class class class wbr 5074 × cxp 5618 ran crn 5621 ↾ cres 5622 “ cima 5623 Fn wfn 6483 ⟶wf 6484 (class class class)co 7359 ℝcr 11033 < clt 11175 ≤ cle 11176 [,)cico 13295 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1975 ax-7 2016 ax-8 2123 ax-9 2131 ax-10 2154 ax-11 2170 ax-12 2191 ax-ext 2713 ax-sep 5220 ax-nul 5230 ax-pow 5296 ax-pr 5364 ax-un 7681 ax-cnex 11090 ax-resscn 11091 ax-pre-lttri 11108 ax-pre-lttrn 11109 |
| This theorem depends on definitions: df-bi 209 df-an 398 df-or 855 df-3or 1094 df-3an 1095 df-tru 1551 df-fal 1561 df-ex 1788 df-nf 1792 df-sb 2075 df-mo 2545 df-eu 2575 df-clab 2720 df-cleq 2733 df-clel 2816 df-nfc 2890 df-ne 2937 df-nel 3041 df-ral 3056 df-rex 3066 df-rab 3394 df-v 3435 df-sbc 3725 df-csb 3833 df-dif 3887 df-un 3889 df-in 3891 df-ss 3901 df-nul 4264 df-if 4457 df-pw 4533 df-sn 4558 df-pr 4560 df-op 4564 df-uni 4841 df-iun 4925 df-br 5075 df-opab 5137 df-mpt 5156 df-id 5515 df-po 5528 df-so 5529 df-xp 5626 df-rel 5627 df-cnv 5628 df-co 5629 df-dm 5630 df-rn 5631 df-res 5632 df-ima 5633 df-iota 6444 df-fun 6490 df-fn 6491 df-f 6492 df-f1 6493 df-fo 6494 df-f1o 6495 df-fv 6496 df-ov 7362 df-oprab 7363 df-mpo 7364 df-1st 7933 df-2nd 7934 df-er 8637 df-en 8888 df-dom 8889 df-sdom 8890 df-pnf 11177 df-mnf 11178 df-xr 11179 df-ltxr 11180 df-le 11181 df-ico 13299 |
| This theorem is referenced by: isbasisrelowllem1 37730 isbasisrelowllem2 37731 icoreclin 37732 |
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