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| Mirrors > Home > MPE Home > Th. List > dyadf | Structured version Visualization version GIF version | ||
| Description: The function 𝐹 returns the endpoints of a dyadic rational covering of the real line. (Contributed by Mario Carneiro, 26-Mar-2015.) |
| Ref | Expression |
|---|---|
| dyadmbl.1 | ⊢ 𝐹 = (𝑥 ∈ ℤ, 𝑦 ∈ ℕ0 ↦ 〈(𝑥 / (2↑𝑦)), ((𝑥 + 1) / (2↑𝑦))〉) |
| Ref | Expression |
|---|---|
| dyadf | ⊢ 𝐹:(ℤ × ℕ0)⟶( ≤ ∩ (ℝ × ℝ)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | zre 12606 | . . . . . . . 8 ⊢ (𝑥 ∈ ℤ → 𝑥 ∈ ℝ) | |
| 2 | 1 | adantr 486 | . . . . . . 7 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → 𝑥 ∈ ℝ) |
| 3 | 2 | lep1d 12157 | . . . . . 6 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → 𝑥 ≤ (𝑥 + 1)) |
| 4 | peano2re 11394 | . . . . . . . 8 ⊢ (𝑥 ∈ ℝ → (𝑥 + 1) ∈ ℝ) | |
| 5 | 2, 4 | syl 18 | . . . . . . 7 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → (𝑥 + 1) ∈ ℝ) |
| 6 | 2nn 12325 | . . . . . . . . . 10 ⊢ 2 ∈ ℕ | |
| 7 | nnexpcl 14123 | . . . . . . . . . 10 ⊢ ((2 ∈ ℕ ∧ 𝑦 ∈ ℕ0) → (2↑𝑦) ∈ ℕ) | |
| 8 | 6, 7 | mpan 703 | . . . . . . . . 9 ⊢ (𝑦 ∈ ℕ0 → (2↑𝑦) ∈ ℕ) |
| 9 | 8 | adantl 487 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → (2↑𝑦) ∈ ℕ) |
| 10 | 9 | nnred 12259 | . . . . . . 7 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → (2↑𝑦) ∈ ℝ) |
| 11 | 9 | nngt0d 12296 | . . . . . . 7 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → 0 < (2↑𝑦)) |
| 12 | lediv1 12091 | . . . . . . 7 ⊢ ((𝑥 ∈ ℝ ∧ (𝑥 + 1) ∈ ℝ ∧ ((2↑𝑦) ∈ ℝ ∧ 0 < (2↑𝑦))) → (𝑥 ≤ (𝑥 + 1) ↔ (𝑥 / (2↑𝑦)) ≤ ((𝑥 + 1) / (2↑𝑦)))) | |
| 13 | 2, 5, 10, 11, 12 | syl112anc 1401 | . . . . . 6 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → (𝑥 ≤ (𝑥 + 1) ↔ (𝑥 / (2↑𝑦)) ≤ ((𝑥 + 1) / (2↑𝑦)))) |
| 14 | 3, 13 | mpbid 235 | . . . . 5 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → (𝑥 / (2↑𝑦)) ≤ ((𝑥 + 1) / (2↑𝑦))) |
| 15 | df-br 5112 | . . . . 5 ⊢ ((𝑥 / (2↑𝑦)) ≤ ((𝑥 + 1) / (2↑𝑦)) ↔ 〈(𝑥 / (2↑𝑦)), ((𝑥 + 1) / (2↑𝑦))〉 ∈ ≤ ) | |
| 16 | 14, 15 | sylib 221 | . . . 4 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → 〈(𝑥 / (2↑𝑦)), ((𝑥 + 1) / (2↑𝑦))〉 ∈ ≤ ) |
| 17 | nndivre 12288 | . . . . . 6 ⊢ ((𝑥 ∈ ℝ ∧ (2↑𝑦) ∈ ℕ) → (𝑥 / (2↑𝑦)) ∈ ℝ) | |
| 18 | 1, 8, 17 | syl2an 608 | . . . . 5 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → (𝑥 / (2↑𝑦)) ∈ ℝ) |
| 19 | 1, 4 | syl 18 | . . . . . 6 ⊢ (𝑥 ∈ ℤ → (𝑥 + 1) ∈ ℝ) |
| 20 | nndivre 12288 | . . . . . 6 ⊢ (((𝑥 + 1) ∈ ℝ ∧ (2↑𝑦) ∈ ℕ) → ((𝑥 + 1) / (2↑𝑦)) ∈ ℝ) | |
| 21 | 19, 8, 20 | syl2an 608 | . . . . 5 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → ((𝑥 + 1) / (2↑𝑦)) ∈ ℝ) |
| 22 | 18, 21 | opelxpd 5702 | . . . 4 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → 〈(𝑥 / (2↑𝑦)), ((𝑥 + 1) / (2↑𝑦))〉 ∈ (ℝ × ℝ)) |
| 23 | 16, 22 | elind 4153 | . . 3 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → 〈(𝑥 / (2↑𝑦)), ((𝑥 + 1) / (2↑𝑦))〉 ∈ ( ≤ ∩ (ℝ × ℝ))) |
| 24 | 23 | rgen2 3207 | . 2 ⊢ ∀𝑥 ∈ ℤ ∀𝑦 ∈ ℕ0 〈(𝑥 / (2↑𝑦)), ((𝑥 + 1) / (2↑𝑦))〉 ∈ ( ≤ ∩ (ℝ × ℝ)) |
| 25 | dyadmbl.1 | . . 3 ⊢ 𝐹 = (𝑥 ∈ ℤ, 𝑦 ∈ ℕ0 ↦ 〈(𝑥 / (2↑𝑦)), ((𝑥 + 1) / (2↑𝑦))〉) | |
| 26 | 25 | fmpo 8067 | . 2 ⊢ (∀𝑥 ∈ ℤ ∀𝑦 ∈ ℕ0 〈(𝑥 / (2↑𝑦)), ((𝑥 + 1) / (2↑𝑦))〉 ∈ ( ≤ ∩ (ℝ × ℝ)) ↔ 𝐹:(ℤ × ℕ0)⟶( ≤ ∩ (ℝ × ℝ))) |
| 27 | 24, 26 | mpbi 233 | 1 ⊢ 𝐹:(ℤ × ℕ0)⟶( ≤ ∩ (ℝ × ℝ)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2146 ∀wral 3081 ∩ cin 3905 〈cop 4597 class class class wbr 5111 × cxp 5661 ⟶wf 6536 (class class class)co 7416 ∈ cmpo 7418 ℝcr 11110 0cc0 11111 1c1 11112 + caddc 11114 < clt 11254 ≤ cle 11255 / cdiv 11882 ℕcn 12244 2c2 12306 ℕ0cn0 12515 ℤcz 12602 ↑cexp 14110 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 ax-un 7738 ax-cnex 11167 ax-resscn 11168 ax-1cn 11169 ax-icn 11170 ax-addcl 11171 ax-addrcl 11172 ax-mulcl 11173 ax-mulrcl 11174 ax-mulcom 11175 ax-addass 11176 ax-mulass 11177 ax-distr 11178 ax-i2m1 11179 ax-1ne0 11180 ax-1rid 11181 ax-rnegex 11182 ax-rrecex 11183 ax-cnre 11184 ax-pre-lttri 11185 ax-pre-lttrn 11186 ax-pre-ltadd 11187 ax-pre-mulgt0 11188 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3067 df-ral 3082 df-rex 3092 df-rmo 3371 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-iun 4960 df-br 5112 df-opab 5176 df-mpt 5195 df-tr 5221 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 6306 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7373 df-ov 7419 df-oprab 7420 df-mpo 7421 df-om 7865 df-1st 7988 df-2nd 7989 df-frecs 8280 df-wrecs 8311 df-recs 8360 df-rdg 8399 df-er 8696 df-en 8946 df-dom 8947 df-sdom 8948 df-pnf 11256 df-mnf 11257 df-xr 11258 df-ltxr 11259 df-le 11260 df-sub 11454 df-neg 11455 df-div 11883 df-nn 12245 df-2 12314 df-n0 12516 df-z 12603 df-uz 12874 df-seq 14051 df-exp 14111 |
| This theorem is used by: dyaddisj 25784 dyadmax 25786 dyadmbllem 25787 dyadmbl 25788 opnmbllem 25789 opnmbllem0 38340 mblfinlem2 38342 |
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