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Mirrors > Home > ILE Home > Th. List > resqrexlemp1rp | GIF version |
Description: Lemma for resqrex 10791. Applying the recursion rule yields a positive real (expressed in a way that will help apply seqf 10227 and similar theorems). (Contributed by Jim Kingdon, 28-Jul-2021.) (Revised by Jim Kingdon, 16-Oct-2022.) |
Ref | Expression |
---|---|
resqrexlem1arp.a | ⊢ (𝜑 → 𝐴 ∈ ℝ) |
resqrexlem1arp.agt0 | ⊢ (𝜑 → 0 ≤ 𝐴) |
Ref | Expression |
---|---|
resqrexlemp1rp | ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → (𝐵(𝑦 ∈ ℝ+, 𝑧 ∈ ℝ+ ↦ ((𝑦 + (𝐴 / 𝑦)) / 2))𝐶) ∈ ℝ+) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqidd 2138 | . . 3 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → (𝑦 ∈ ℝ+, 𝑧 ∈ ℝ+ ↦ ((𝑦 + (𝐴 / 𝑦)) / 2)) = (𝑦 ∈ ℝ+, 𝑧 ∈ ℝ+ ↦ ((𝑦 + (𝐴 / 𝑦)) / 2))) | |
2 | id 19 | . . . . . 6 ⊢ (𝑦 = 𝐵 → 𝑦 = 𝐵) | |
3 | oveq2 5775 | . . . . . 6 ⊢ (𝑦 = 𝐵 → (𝐴 / 𝑦) = (𝐴 / 𝐵)) | |
4 | 2, 3 | oveq12d 5785 | . . . . 5 ⊢ (𝑦 = 𝐵 → (𝑦 + (𝐴 / 𝑦)) = (𝐵 + (𝐴 / 𝐵))) |
5 | 4 | oveq1d 5782 | . . . 4 ⊢ (𝑦 = 𝐵 → ((𝑦 + (𝐴 / 𝑦)) / 2) = ((𝐵 + (𝐴 / 𝐵)) / 2)) |
6 | 5 | ad2antrl 481 | . . 3 ⊢ (((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) ∧ (𝑦 = 𝐵 ∧ 𝑧 = 𝐶)) → ((𝑦 + (𝐴 / 𝑦)) / 2) = ((𝐵 + (𝐴 / 𝐵)) / 2)) |
7 | simprl 520 | . . 3 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → 𝐵 ∈ ℝ+) | |
8 | simprr 521 | . . 3 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → 𝐶 ∈ ℝ+) | |
9 | 7 | rpred 9476 | . . . . 5 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → 𝐵 ∈ ℝ) |
10 | resqrexlem1arp.a | . . . . . . 7 ⊢ (𝜑 → 𝐴 ∈ ℝ) | |
11 | 10 | adantr 274 | . . . . . 6 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → 𝐴 ∈ ℝ) |
12 | 11, 7 | rerpdivcld 9508 | . . . . 5 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → (𝐴 / 𝐵) ∈ ℝ) |
13 | 9, 12 | readdcld 7788 | . . . 4 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → (𝐵 + (𝐴 / 𝐵)) ∈ ℝ) |
14 | 13 | rehalfcld 8959 | . . 3 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → ((𝐵 + (𝐴 / 𝐵)) / 2) ∈ ℝ) |
15 | 1, 6, 7, 8, 14 | ovmpod 5891 | . 2 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → (𝐵(𝑦 ∈ ℝ+, 𝑧 ∈ ℝ+ ↦ ((𝑦 + (𝐴 / 𝑦)) / 2))𝐶) = ((𝐵 + (𝐴 / 𝐵)) / 2)) |
16 | 7 | rpgt0d 9479 | . . . . 5 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → 0 < 𝐵) |
17 | resqrexlem1arp.agt0 | . . . . . . 7 ⊢ (𝜑 → 0 ≤ 𝐴) | |
18 | 17 | adantr 274 | . . . . . 6 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → 0 ≤ 𝐴) |
19 | 11, 7, 18 | divge0d 9517 | . . . . 5 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → 0 ≤ (𝐴 / 𝐵)) |
20 | addgtge0 8205 | . . . . 5 ⊢ (((𝐵 ∈ ℝ ∧ (𝐴 / 𝐵) ∈ ℝ) ∧ (0 < 𝐵 ∧ 0 ≤ (𝐴 / 𝐵))) → 0 < (𝐵 + (𝐴 / 𝐵))) | |
21 | 9, 12, 16, 19, 20 | syl22anc 1217 | . . . 4 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → 0 < (𝐵 + (𝐴 / 𝐵))) |
22 | 13, 21 | elrpd 9474 | . . 3 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → (𝐵 + (𝐴 / 𝐵)) ∈ ℝ+) |
23 | 22 | rphalfcld 9489 | . 2 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → ((𝐵 + (𝐴 / 𝐵)) / 2) ∈ ℝ+) |
24 | 15, 23 | eqeltrd 2214 | 1 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → (𝐵(𝑦 ∈ ℝ+, 𝑧 ∈ ℝ+ ↦ ((𝑦 + (𝐴 / 𝑦)) / 2))𝐶) ∈ ℝ+) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 = wceq 1331 ∈ wcel 1480 class class class wbr 3924 (class class class)co 5767 ∈ cmpo 5769 ℝcr 7612 0cc0 7613 + caddc 7616 < clt 7793 ≤ cle 7794 / cdiv 8425 2c2 8764 ℝ+crp 9434 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-sep 4041 ax-pow 4093 ax-pr 4126 ax-un 4350 ax-setind 4447 ax-cnex 7704 ax-resscn 7705 ax-1cn 7706 ax-1re 7707 ax-icn 7708 ax-addcl 7709 ax-addrcl 7710 ax-mulcl 7711 ax-mulrcl 7712 ax-addcom 7713 ax-mulcom 7714 ax-addass 7715 ax-mulass 7716 ax-distr 7717 ax-i2m1 7718 ax-0lt1 7719 ax-1rid 7720 ax-0id 7721 ax-rnegex 7722 ax-precex 7723 ax-cnre 7724 ax-pre-ltirr 7725 ax-pre-ltwlin 7726 ax-pre-lttrn 7727 ax-pre-apti 7728 ax-pre-ltadd 7729 ax-pre-mulgt0 7730 ax-pre-mulext 7731 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-eu 2000 df-mo 2001 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ne 2307 df-nel 2402 df-ral 2419 df-rex 2420 df-reu 2421 df-rmo 2422 df-rab 2423 df-v 2683 df-sbc 2905 df-dif 3068 df-un 3070 df-in 3072 df-ss 3079 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-br 3925 df-opab 3985 df-id 4210 df-po 4213 df-iso 4214 df-xp 4540 df-rel 4541 df-cnv 4542 df-co 4543 df-dm 4544 df-iota 5083 df-fun 5120 df-fv 5126 df-riota 5723 df-ov 5770 df-oprab 5771 df-mpo 5772 df-pnf 7795 df-mnf 7796 df-xr 7797 df-ltxr 7798 df-le 7799 df-sub 7928 df-neg 7929 df-reap 8330 df-ap 8337 df-div 8426 df-2 8772 df-rp 9435 |
This theorem is referenced by: resqrexlemf 10772 resqrexlemf1 10773 resqrexlemfp1 10774 |
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