| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 12619 | . . . . . . . 8 ⊢ (𝑥 ∈ ℤ → 𝑥 ∈ ℝ) | |
| 2 | 1 | adantr 486 | . . . . . . 7 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → 𝑥 ∈ ℝ) |
| 3 | 2 | lep1d 12170 | . . . . . 6 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → 𝑥 ≤ (𝑥 + 1)) |
| 4 | peano2re 11407 | . . . . . . . 8 ⊢ (𝑥 ∈ ℝ → (𝑥 + 1) ∈ ℝ) | |
| 5 | 2, 4 | syl 18 | . . . . . . 7 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → (𝑥 + 1) ∈ ℝ) |
| 6 | 2nn 12338 | . . . . . . . . . 10 ⊢ 2 ∈ ℕ | |
| 7 | nnexpcl 14138 | . . . . . . . . . 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 12272 | . . . . . . 7 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → (2↑𝑦) ∈ ℝ) |
| 11 | 9 | nngt0d 12309 | . . . . . . 7 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → 0 < (2↑𝑦)) |
| 12 | lediv1 12104 | . . . . . . 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 5104 | . . . . 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 12301 | . . . . . 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 12301 | . . . . . 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 5694 | . . . 4 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → 〈(𝑥 / (2↑𝑦)), ((𝑥 + 1) / (2↑𝑦))〉 ∈ (ℝ × ℝ)) |
| 23 | 16, 22 | elind 4146 | . . 3 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → 〈(𝑥 / (2↑𝑦)), ((𝑥 + 1) / (2↑𝑦))〉 ∈ ( ≤ ∩ (ℝ × ℝ))) |
| 24 | 23 | rgen2 3202 | . 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 8065 | . 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 2145 ∀wral 3076 ∩ cin 3898 〈cop 4590 class class class wbr 5103 × cxp 5653 ⟶wf 6529 (class class class)co 7413 ∈ cmpo 7415 ℝcr 11123 0cc0 11124 1c1 11125 + caddc 11127 < clt 11267 ≤ cle 11268 / cdiv 11895 ℕcn 12257 2c2 12319 ℕ0cn0 12528 ℤcz 12615 ↑cexp 14125 |
| 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 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 ax-un 7736 ax-cnex 11180 ax-resscn 11181 ax-1cn 11182 ax-icn 11183 ax-addcl 11184 ax-addrcl 11185 ax-mulcl 11186 ax-mulrcl 11187 ax-mulcom 11188 ax-addass 11189 ax-mulass 11190 ax-distr 11191 ax-i2m1 11192 ax-1ne0 11193 ax-1rid 11194 ax-rnegex 11195 ax-rrecex 11196 ax-cnre 11197 ax-pre-lttri 11198 ax-pre-lttrn 11199 ax-pre-ltadd 11200 ax-pre-mulgt0 11201 |
| 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 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6299 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-riota 7370 df-ov 7416 df-oprab 7417 df-mpo 7418 df-om 7863 df-1st 7986 df-2nd 7987 df-frecs 8280 df-wrecs 8311 df-recs 8360 df-rdg 8399 df-er 8696 df-en 8953 df-dom 8954 df-sdom 8955 df-pnf 11269 df-mnf 11270 df-xr 11271 df-ltxr 11272 df-le 11273 df-sub 11467 df-neg 11468 df-div 11896 df-nn 12258 df-2 12327 df-n0 12529 df-z 12616 df-uz 12888 df-seq 14066 df-exp 14126 |
| This theorem is used by: dyaddisj 25824 dyadmax 25826 dyadmbllem 25827 dyadmbl 25828 opnmbllem 25829 opnmbllem0 38405 mblfinlem2 38407 |
| Copyright terms: Public domain | W3C validator |