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| Mirrors > Home > ILE Home > Th. List > resqrexlemp1rp | GIF version | ||
| Description: Lemma for resqrex 11736. Applying the recursion rule yields a positive real (expressed in a way that will help apply seqf 10850 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 2235 | . . 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 6066 | . . . . . 6 ⊢ (𝑦 = 𝐵 → (𝐴 / 𝑦) = (𝐴 / 𝐵)) | |
| 4 | 2, 3 | oveq12d 6076 | . . . . 5 ⊢ (𝑦 = 𝐵 → (𝑦 + (𝐴 / 𝑦)) = (𝐵 + (𝐴 / 𝐵))) |
| 5 | 4 | oveq1d 6073 | . . . 4 ⊢ (𝑦 = 𝐵 → ((𝑦 + (𝐴 / 𝑦)) / 2) = ((𝐵 + (𝐴 / 𝐵)) / 2)) |
| 6 | 5 | ad2antrl 490 | . . 3 ⊢ (((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) ∧ (𝑦 = 𝐵 ∧ 𝑧 = 𝐶)) → ((𝑦 + (𝐴 / 𝑦)) / 2) = ((𝐵 + (𝐴 / 𝐵)) / 2)) |
| 7 | simprl 531 | . . 3 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → 𝐵 ∈ ℝ+) | |
| 8 | simprr 533 | . . 3 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → 𝐶 ∈ ℝ+) | |
| 9 | 7 | rpred 10047 | . . . . 5 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → 𝐵 ∈ ℝ) |
| 10 | resqrexlem1arp.a | . . . . . . 7 ⊢ (𝜑 → 𝐴 ∈ ℝ) | |
| 11 | 10 | adantr 276 | . . . . . 6 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → 𝐴 ∈ ℝ) |
| 12 | 11, 7 | rerpdivcld 10079 | . . . . 5 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → (𝐴 / 𝐵) ∈ ℝ) |
| 13 | 9, 12 | readdcld 8319 | . . . 4 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → (𝐵 + (𝐴 / 𝐵)) ∈ ℝ) |
| 14 | 13 | rehalfcld 9502 | . . 3 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → ((𝐵 + (𝐴 / 𝐵)) / 2) ∈ ℝ) |
| 15 | 1, 6, 7, 8, 14 | ovmpod 6189 | . 2 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → (𝐵(𝑦 ∈ ℝ+, 𝑧 ∈ ℝ+ ↦ ((𝑦 + (𝐴 / 𝑦)) / 2))𝐶) = ((𝐵 + (𝐴 / 𝐵)) / 2)) |
| 16 | 7 | rpgt0d 10050 | . . . . 5 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → 0 < 𝐵) |
| 17 | resqrexlem1arp.agt0 | . . . . . . 7 ⊢ (𝜑 → 0 ≤ 𝐴) | |
| 18 | 17 | adantr 276 | . . . . . 6 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → 0 ≤ 𝐴) |
| 19 | 11, 7, 18 | divge0d 10088 | . . . . 5 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → 0 ≤ (𝐴 / 𝐵)) |
| 20 | addgtge0 8741 | . . . . 5 ⊢ (((𝐵 ∈ ℝ ∧ (𝐴 / 𝐵) ∈ ℝ) ∧ (0 < 𝐵 ∧ 0 ≤ (𝐴 / 𝐵))) → 0 < (𝐵 + (𝐴 / 𝐵))) | |
| 21 | 9, 12, 16, 19, 20 | syl22anc 1275 | . . . 4 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → 0 < (𝐵 + (𝐴 / 𝐵))) |
| 22 | 13, 21 | elrpd 10044 | . . 3 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → (𝐵 + (𝐴 / 𝐵)) ∈ ℝ+) |
| 23 | 22 | rphalfcld 10060 | . 2 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → ((𝐵 + (𝐴 / 𝐵)) / 2) ∈ ℝ+) |
| 24 | 15, 23 | eqeltrd 2311 | 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 104 = wceq 1398 ∈ wcel 2205 class class class wbr 4114 (class class class)co 6058 ∈ cmpo 6060 ℝcr 8142 0cc0 8143 + caddc 8146 < clt 8324 ≤ cle 8325 / cdiv 8963 2c2 9305 ℝ+crp 10004 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2207 ax-14 2208 ax-ext 2216 ax-sep 4233 ax-pow 4292 ax-pr 4327 ax-un 4559 ax-setind 4664 ax-cnex 8234 ax-resscn 8235 ax-1cn 8236 ax-1re 8237 ax-icn 8238 ax-addcl 8239 ax-addrcl 8240 ax-mulcl 8241 ax-mulrcl 8242 ax-addcom 8243 ax-mulcom 8244 ax-addass 8245 ax-mulass 8246 ax-distr 8247 ax-i2m1 8248 ax-0lt1 8249 ax-1rid 8250 ax-0id 8251 ax-rnegex 8252 ax-precex 8253 ax-cnre 8254 ax-pre-ltirr 8255 ax-pre-ltwlin 8256 ax-pre-lttrn 8257 ax-pre-apti 8258 ax-pre-ltadd 8259 ax-pre-mulgt0 8260 ax-pre-mulext 8261 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2085 df-mo 2086 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ne 2415 df-nel 2510 df-ral 2527 df-rex 2528 df-reu 2529 df-rmo 2530 df-rab 2531 df-v 2817 df-sbc 3046 df-dif 3216 df-un 3218 df-in 3220 df-ss 3227 df-pw 3676 df-sn 3700 df-pr 3701 df-op 3703 df-uni 3920 df-br 4115 df-opab 4177 df-id 4419 df-po 4422 df-iso 4423 df-xp 4760 df-rel 4761 df-cnv 4762 df-co 4763 df-dm 4764 df-iota 5317 df-fun 5359 df-fv 5365 df-riota 6011 df-ov 6061 df-oprab 6062 df-mpo 6063 df-pnf 8326 df-mnf 8327 df-xr 8328 df-ltxr 8329 df-le 8330 df-sub 8462 df-neg 8463 df-reap 8866 df-ap 8873 df-div 8964 df-2 9313 df-rp 10005 |
| This theorem is referenced by: resqrexlemf 11717 resqrexlemf1 11718 resqrexlemfp1 11719 |
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