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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 5644 | . . . . . 6 ⊢ ([,) “ (ℝ × ℝ)) = ran ([,) ↾ (ℝ × ℝ)) | |
| 3 | 1, 2 | eqtri 2759 | . . . . 5 ⊢ 𝐼 = ran ([,) ↾ (ℝ × ℝ)) |
| 4 | 3 | eleq2i 2828 | . . . 4 ⊢ (𝑋 ∈ 𝐼 ↔ 𝑋 ∈ ran ([,) ↾ (ℝ × ℝ))) |
| 5 | icoreresf 37668 | . . . . 5 ⊢ ([,) ↾ (ℝ × ℝ)):(ℝ × ℝ)⟶𝒫 ℝ | |
| 6 | ffn 6668 | . . . . 5 ⊢ (([,) ↾ (ℝ × ℝ)):(ℝ × ℝ)⟶𝒫 ℝ → ([,) ↾ (ℝ × ℝ)) Fn (ℝ × ℝ)) | |
| 7 | ovelrn 7543 | . . . . 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 7533 | . . . . 5 ⊢ ((𝑎 ∈ ℝ ∧ 𝑏 ∈ ℝ) → (𝑎([,) ↾ (ℝ × ℝ))𝑏) = (𝑎[,)𝑏)) | |
| 11 | 10 | eqeq2d 2747 | . . . 4 ⊢ ((𝑎 ∈ ℝ ∧ 𝑏 ∈ ℝ) → (𝑋 = (𝑎([,) ↾ (ℝ × ℝ))𝑏) ↔ 𝑋 = (𝑎[,)𝑏))) |
| 12 | 11 | 2rexbiia 3198 | . . 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 37669 | . . . 4 ⊢ ((𝑎 ∈ ℝ ∧ 𝑏 ∈ ℝ) → (𝑎[,)𝑏) = {𝑧 ∈ ℝ ∣ (𝑎 ≤ 𝑧 ∧ 𝑧 < 𝑏)}) | |
| 15 | 14 | eqeq2d 2747 | . . 3 ⊢ ((𝑎 ∈ ℝ ∧ 𝑏 ∈ ℝ) → (𝑋 = (𝑎[,)𝑏) ↔ 𝑋 = {𝑧 ∈ ℝ ∣ (𝑎 ≤ 𝑧 ∧ 𝑧 < 𝑏)})) |
| 16 | 15 | 2rexbiia 3198 | . 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 1542 ∈ wcel 2114 ∃wrex 3061 {crab 3389 𝒫 cpw 4541 class class class wbr 5085 × cxp 5629 ran crn 5632 ↾ cres 5633 “ cima 5634 Fn wfn 6493 ⟶wf 6494 (class class class)co 7367 ℝcr 11037 < clt 11179 ≤ cle 11180 [,)cico 13300 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 ax-cnex 11094 ax-resscn 11095 ax-pre-lttri 11112 ax-pre-lttrn 11113 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3062 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-iun 4935 df-br 5086 df-opab 5148 df-mpt 5167 df-id 5526 df-po 5539 df-so 5540 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-ov 7370 df-oprab 7371 df-mpo 7372 df-1st 7942 df-2nd 7943 df-er 8643 df-en 8894 df-dom 8895 df-sdom 8896 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-ico 13304 |
| This theorem is referenced by: isbasisrelowllem1 37671 isbasisrelowllem2 37672 icoreclin 37673 |
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