| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > ILE Home > Th. List > resqrexlemp1rp | GIF version | ||
| Description: Lemma for resqrex 11711. Applying the recursion rule yields a positive real (expressed in a way that will help apply seqf 10826 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 2233 | . . 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 6058 | . . . . . 6 ⊢ (𝑦 = 𝐵 → (𝐴 / 𝑦) = (𝐴 / 𝐵)) | |
| 4 | 2, 3 | oveq12d 6068 | . . . . 5 ⊢ (𝑦 = 𝐵 → (𝑦 + (𝐴 / 𝑦)) = (𝐵 + (𝐴 / 𝐵))) |
| 5 | 4 | oveq1d 6065 | . . . 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 10029 | . . . . 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 10061 | . . . . 5 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → (𝐴 / 𝐵) ∈ ℝ) |
| 13 | 9, 12 | readdcld 8303 | . . . 4 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → (𝐵 + (𝐴 / 𝐵)) ∈ ℝ) |
| 14 | 13 | rehalfcld 9485 | . . 3 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → ((𝐵 + (𝐴 / 𝐵)) / 2) ∈ ℝ) |
| 15 | 1, 6, 7, 8, 14 | ovmpod 6181 | . 2 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → (𝐵(𝑦 ∈ ℝ+, 𝑧 ∈ ℝ+ ↦ ((𝑦 + (𝐴 / 𝑦)) / 2))𝐶) = ((𝐵 + (𝐴 / 𝐵)) / 2)) |
| 16 | 7 | rpgt0d 10032 | . . . . 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 10070 | . . . . 5 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → 0 ≤ (𝐴 / 𝐵)) |
| 20 | addgtge0 8724 | . . . . 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 10026 | . . 3 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → (𝐵 + (𝐴 / 𝐵)) ∈ ℝ+) |
| 23 | 22 | rphalfcld 10042 | . 2 ⊢ ((𝜑 ∧ (𝐵 ∈ ℝ+ ∧ 𝐶 ∈ ℝ+)) → ((𝐵 + (𝐴 / 𝐵)) / 2) ∈ ℝ+) |
| 24 | 15, 23 | eqeltrd 2309 | 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 2203 class class class wbr 4109 (class class class)co 6050 ∈ cmpo 6052 ℝcr 8126 0cc0 8127 + caddc 8130 < clt 8308 ≤ cle 8309 / cdiv 8946 2c2 9288 ℝ+crp 9986 |
| 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 2205 ax-14 2206 ax-ext 2214 ax-sep 4228 ax-pow 4287 ax-pr 4322 ax-un 4554 ax-setind 4659 ax-cnex 8218 ax-resscn 8219 ax-1cn 8220 ax-1re 8221 ax-icn 8222 ax-addcl 8223 ax-addrcl 8224 ax-mulcl 8225 ax-mulrcl 8226 ax-addcom 8227 ax-mulcom 8228 ax-addass 8229 ax-mulass 8230 ax-distr 8231 ax-i2m1 8232 ax-0lt1 8233 ax-1rid 8234 ax-0id 8235 ax-rnegex 8236 ax-precex 8237 ax-cnre 8238 ax-pre-ltirr 8239 ax-pre-ltwlin 8240 ax-pre-lttrn 8241 ax-pre-apti 8242 ax-pre-ltadd 8243 ax-pre-mulgt0 8244 ax-pre-mulext 8245 |
| 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 2083 df-mo 2084 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ne 2413 df-nel 2508 df-ral 2525 df-rex 2526 df-reu 2527 df-rmo 2528 df-rab 2529 df-v 2815 df-sbc 3043 df-dif 3213 df-un 3215 df-in 3217 df-ss 3224 df-pw 3671 df-sn 3695 df-pr 3696 df-op 3698 df-uni 3915 df-br 4110 df-opab 4172 df-id 4414 df-po 4417 df-iso 4418 df-xp 4755 df-rel 4756 df-cnv 4757 df-co 4758 df-dm 4759 df-iota 5312 df-fun 5354 df-fv 5360 df-riota 6003 df-ov 6053 df-oprab 6054 df-mpo 6055 df-pnf 8310 df-mnf 8311 df-xr 8312 df-ltxr 8313 df-le 8314 df-sub 8446 df-neg 8447 df-reap 8849 df-ap 8856 df-div 8947 df-2 9296 df-rp 9987 |
| This theorem is referenced by: resqrexlemf 11692 resqrexlemf1 11693 resqrexlemfp1 11694 |
| Copyright terms: Public domain | W3C validator |