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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 12690 | . . . . . . . 8 ⊢ (𝑥 ∈ ℤ → 𝑥 ∈ ℝ) | |
| 2 | 1 | adantr 486 | . . . . . . 7 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → 𝑥 ∈ ℝ) |
| 3 | 2 | lep1d 12241 | . . . . . 6 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → 𝑥 ≤ (𝑥 + 1)) |
| 4 | peano2re 11476 | . . . . . . . 8 ⊢ (𝑥 ∈ ℝ → (𝑥 + 1) ∈ ℝ) | |
| 5 | 2, 4 | syl 18 | . . . . . . 7 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → (𝑥 + 1) ∈ ℝ) |
| 6 | 2nn 12409 | . . . . . . . . . 10 ⊢ 2 ∈ ℕ | |
| 7 | nnexpcl 14210 | . . . . . . . . . 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 12343 | . . . . . . 7 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → (2↑𝑦) ∈ ℝ) |
| 11 | 9 | nngt0d 12380 | . . . . . . 7 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ0) → 0 < (2↑𝑦)) |
| 12 | lediv1 12175 | . . . . . . 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 12372 | . . . . . 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 12372 | . . . . . 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 5690 | . . . 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 3203 | . 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 8077 | . 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 3077 ∩ cin 3898 〈cop 4590 class class class wbr 5103 × cxp 5649 ⟶wf 6533 (class class class)co 7418 ∈ cmpo 7420 ℝcr 11192 0cc0 11193 1c1 11194 + caddc 11196 < clt 11336 ≤ cle 11337 / cdiv 11966 ℕcn 12328 2c2 12390 ℕ0cn0 12599 ℤcz 12686 ↑cexp 14197 |
| 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 2733 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7749 ax-cnex 11249 ax-resscn 11250 ax-1cn 11251 ax-icn 11252 ax-addcl 11253 ax-addrcl 11254 ax-mulcl 11255 ax-mulrcl 11256 ax-mulcom 11257 ax-addass 11258 ax-mulass 11259 ax-distr 11260 ax-i2m1 11261 ax-1ne0 11262 ax-1rid 11263 ax-rnegex 11264 ax-rrecex 11265 ax-cnre 11266 ax-pre-lttri 11267 ax-pre-lttrn 11268 ax-pre-ltadd 11269 ax-pre-mulgt0 11270 |
| 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 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3453 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 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7375 df-ov 7421 df-oprab 7422 df-mpo 7423 df-om 7876 df-1st 7999 df-2nd 8000 df-frecs 8292 df-wrecs 8323 df-recs 8372 df-rdg 8411 df-er 8710 df-en 8967 df-dom 8968 df-sdom 8969 df-pnf 11338 df-mnf 11339 df-xr 11340 df-ltxr 11341 df-le 11342 df-sub 11536 df-neg 11537 df-div 11967 df-nn 12329 df-2 12398 df-n0 12600 df-z 12687 df-uz 12959 df-seq 14138 df-exp 14198 |
| This theorem is used by: dyaddisj 25910 dyadmax 25912 dyadmbllem 25913 dyadmbl 25914 opnmbllem 25915 opnmbllem0 38554 mblfinlem2 38556 |
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