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Mirrors > Home > ILE Home > Th. List > resqrexlemdec | GIF version |
Description: Lemma for resqrex 9912. The sequence is decreasing. (Contributed by Mario Carneiro and Jim Kingdon, 29-Jul-2021.) |
Ref | Expression |
---|---|
resqrexlemex.seq | ⊢ 𝐹 = seq1((𝑦 ∈ ℝ+, 𝑧 ∈ ℝ+ ↦ ((𝑦 + (𝐴 / 𝑦)) / 2)), (ℕ × {(1 + 𝐴)}), ℝ+) |
resqrexlemex.a | ⊢ (𝜑 → 𝐴 ∈ ℝ) |
resqrexlemex.agt0 | ⊢ (𝜑 → 0 ≤ 𝐴) |
Ref | Expression |
---|---|
resqrexlemdec | ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → (𝐹‘(𝑁 + 1)) < (𝐹‘𝑁)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | resqrexlemex.seq | . . 3 ⊢ 𝐹 = seq1((𝑦 ∈ ℝ+, 𝑧 ∈ ℝ+ ↦ ((𝑦 + (𝐴 / 𝑦)) / 2)), (ℕ × {(1 + 𝐴)}), ℝ+) | |
2 | resqrexlemex.a | . . 3 ⊢ (𝜑 → 𝐴 ∈ ℝ) | |
3 | resqrexlemex.agt0 | . . 3 ⊢ (𝜑 → 0 ≤ 𝐴) | |
4 | 1, 2, 3 | resqrexlemfp1 9895 | . 2 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → (𝐹‘(𝑁 + 1)) = (((𝐹‘𝑁) + (𝐴 / (𝐹‘𝑁))) / 2)) |
5 | 2 | adantr 270 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → 𝐴 ∈ ℝ) |
6 | 1, 2, 3 | resqrexlemf 9893 | . . . . . . 7 ⊢ (𝜑 → 𝐹:ℕ⟶ℝ+) |
7 | 6 | ffvelrnda 5323 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → (𝐹‘𝑁) ∈ ℝ+) |
8 | 5, 7 | rerpdivcld 8805 | . . . . 5 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → (𝐴 / (𝐹‘𝑁)) ∈ ℝ) |
9 | 7 | rpred 8773 | . . . . 5 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → (𝐹‘𝑁) ∈ ℝ) |
10 | 1, 2, 3 | resqrexlemover 9896 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → 𝐴 < ((𝐹‘𝑁)↑2)) |
11 | 7 | rpcnd 8775 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → (𝐹‘𝑁) ∈ ℂ) |
12 | 11 | sqvald 9602 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → ((𝐹‘𝑁)↑2) = ((𝐹‘𝑁) · (𝐹‘𝑁))) |
13 | 10, 12 | breqtrd 3809 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → 𝐴 < ((𝐹‘𝑁) · (𝐹‘𝑁))) |
14 | 5, 9, 7 | ltdivmuld 8825 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → ((𝐴 / (𝐹‘𝑁)) < (𝐹‘𝑁) ↔ 𝐴 < ((𝐹‘𝑁) · (𝐹‘𝑁)))) |
15 | 13, 14 | mpbird 165 | . . . . 5 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → (𝐴 / (𝐹‘𝑁)) < (𝐹‘𝑁)) |
16 | 8, 9, 9, 15 | ltadd2dd 7526 | . . . 4 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → ((𝐹‘𝑁) + (𝐴 / (𝐹‘𝑁))) < ((𝐹‘𝑁) + (𝐹‘𝑁))) |
17 | 11 | 2timesd 8273 | . . . 4 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → (2 · (𝐹‘𝑁)) = ((𝐹‘𝑁) + (𝐹‘𝑁))) |
18 | 16, 17 | breqtrrd 3811 | . . 3 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → ((𝐹‘𝑁) + (𝐴 / (𝐹‘𝑁))) < (2 · (𝐹‘𝑁))) |
19 | 9, 8 | readdcld 7148 | . . . 4 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → ((𝐹‘𝑁) + (𝐴 / (𝐹‘𝑁))) ∈ ℝ) |
20 | 2rp 8739 | . . . . 5 ⊢ 2 ∈ ℝ+ | |
21 | 20 | a1i 9 | . . . 4 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → 2 ∈ ℝ+) |
22 | 19, 9, 21 | ltdivmuld 8825 | . . 3 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → ((((𝐹‘𝑁) + (𝐴 / (𝐹‘𝑁))) / 2) < (𝐹‘𝑁) ↔ ((𝐹‘𝑁) + (𝐴 / (𝐹‘𝑁))) < (2 · (𝐹‘𝑁)))) |
23 | 18, 22 | mpbird 165 | . 2 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → (((𝐹‘𝑁) + (𝐴 / (𝐹‘𝑁))) / 2) < (𝐹‘𝑁)) |
24 | 4, 23 | eqbrtrd 3805 | 1 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → (𝐹‘(𝑁 + 1)) < (𝐹‘𝑁)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 102 = wceq 1284 ∈ wcel 1433 {csn 3398 class class class wbr 3785 × cxp 4361 ‘cfv 4922 (class class class)co 5532 ↦ cmpt2 5534 ℝcr 6980 0cc0 6981 1c1 6982 + caddc 6984 · cmul 6986 < clt 7153 ≤ cle 7154 / cdiv 7760 ℕcn 8039 2c2 8089 ℝ+crp 8734 seqcseq 9431 ↑cexp 9475 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-13 1444 ax-14 1445 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-coll 3893 ax-sep 3896 ax-nul 3904 ax-pow 3948 ax-pr 3964 ax-un 4188 ax-setind 4280 ax-iinf 4329 ax-cnex 7067 ax-resscn 7068 ax-1cn 7069 ax-1re 7070 ax-icn 7071 ax-addcl 7072 ax-addrcl 7073 ax-mulcl 7074 ax-mulrcl 7075 ax-addcom 7076 ax-mulcom 7077 ax-addass 7078 ax-mulass 7079 ax-distr 7080 ax-i2m1 7081 ax-0lt1 7082 ax-1rid 7083 ax-0id 7084 ax-rnegex 7085 ax-precex 7086 ax-cnre 7087 ax-pre-ltirr 7088 ax-pre-ltwlin 7089 ax-pre-lttrn 7090 ax-pre-apti 7091 ax-pre-ltadd 7092 ax-pre-mulgt0 7093 ax-pre-mulext 7094 |
This theorem depends on definitions: df-bi 115 df-dc 776 df-3or 920 df-3an 921 df-tru 1287 df-fal 1290 df-nf 1390 df-sb 1686 df-eu 1944 df-mo 1945 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-ne 2246 df-nel 2340 df-ral 2353 df-rex 2354 df-reu 2355 df-rmo 2356 df-rab 2357 df-v 2603 df-sbc 2816 df-csb 2909 df-dif 2975 df-un 2977 df-in 2979 df-ss 2986 df-nul 3252 df-if 3352 df-pw 3384 df-sn 3404 df-pr 3405 df-op 3407 df-uni 3602 df-int 3637 df-iun 3680 df-br 3786 df-opab 3840 df-mpt 3841 df-tr 3876 df-id 4048 df-po 4051 df-iso 4052 df-iord 4121 df-on 4123 df-suc 4126 df-iom 4332 df-xp 4369 df-rel 4370 df-cnv 4371 df-co 4372 df-dm 4373 df-rn 4374 df-res 4375 df-ima 4376 df-iota 4887 df-fun 4924 df-fn 4925 df-f 4926 df-f1 4927 df-fo 4928 df-f1o 4929 df-fv 4930 df-riota 5488 df-ov 5535 df-oprab 5536 df-mpt2 5537 df-1st 5787 df-2nd 5788 df-recs 5943 df-frec 6001 df-pnf 7155 df-mnf 7156 df-xr 7157 df-ltxr 7158 df-le 7159 df-sub 7281 df-neg 7282 df-reap 7675 df-ap 7682 df-div 7761 df-inn 8040 df-2 8098 df-3 8099 df-4 8100 df-n0 8289 df-z 8352 df-uz 8620 df-rp 8735 df-iseq 9432 df-iexp 9476 |
This theorem is referenced by: resqrexlemdecn 9898 |
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