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Theorem resqrexlemsqa 9622

Description: Lemma for resqrex 9624. The square of a limit is 𝐴. (Contributed by Jim Kingdon, 7-Aug-2021.)

**Hypotheses**
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)
resqrexlemgt0.rr	⊢ (𝜑 → 𝐿 ∈ ℝ)
resqrexlemgt0.lim	⊢ (𝜑 → ∀𝑒 ∈ ℝ⁺ ∃𝑗 ∈ ℕ ∀𝑖 ∈ (ℤ_≥‘𝑗)((𝐹‘𝑖) < (𝐿 + 𝑒) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑒)))

**Assertion**
Ref	Expression
resqrexlemsqa	⊢ (𝜑 → (𝐿↑2) = 𝐴)

Distinct variable groups: 𝐴,𝑒,𝑗 𝑦,𝐴,𝑧 𝑒,𝐹,𝑗 𝑦,𝐹,𝑧 𝑖,𝐹 𝑒,𝐿,𝑗,𝑖 𝑦,𝐿,𝑧 𝑒,𝑖,𝑗 𝜑,𝑦,𝑧 Allowed substitution hints: 𝜑(𝑒,𝑖,𝑗) 𝐴(𝑖)

Proof of Theorem resqrexlemsqa Dummy variables 𝑎 𝑏 𝑐 𝑑 𝑥 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		resqrexlemex.seq	. . . . . . 7 ⊢ 𝐹 = seq1((𝑦 ∈ ℝ⁺, 𝑧 ∈ ℝ⁺ ↦ ((𝑦 + (𝐴 / 𝑦)) / 2)), (ℕ × {(1 + 𝐴)}), ℝ⁺)
2		resqrexlemex.a	. . . . . . 7 ⊢ (𝜑 → 𝐴 ∈ ℝ)
3		resqrexlemex.agt0	. . . . . . 7 ⊢ (𝜑 → 0 ≤ 𝐴)
4	1, 2, 3	resqrexlemf 9605	. . . . . 6 ⊢ (𝜑 → 𝐹:ℕ⟶ℝ⁺)
5	4	ffvelrnda 5302	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ ℕ) → (𝐹‘𝑥) ∈ ℝ⁺)
6		2z 8273	. . . . . 6 ⊢ 2 ∈ ℤ
7	6	a1i 9	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ ℕ) → 2 ∈ ℤ)
8	5, 7	rpexpcld 9404	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ ℕ) → ((𝐹‘𝑥)↑2) ∈ ℝ⁺)
9		eqid 2040	. . . 4 ⊢ (𝑥 ∈ ℕ ↦ ((𝐹‘𝑥)↑2)) = (𝑥 ∈ ℕ ↦ ((𝐹‘𝑥)↑2))
10	8, 9	fmptd 5322	. . 3 ⊢ (𝜑 → (𝑥 ∈ ℕ ↦ ((𝐹‘𝑥)↑2)):ℕ⟶ℝ⁺)
11		rpssre 8593	. . . 4 ⊢ ℝ⁺ ⊆ ℝ
12	11	a1i 9	. . 3 ⊢ (𝜑 → ℝ⁺ ⊆ ℝ)
13	10, 12	fssd 5055	. 2 ⊢ (𝜑 → (𝑥 ∈ ℕ ↦ ((𝐹‘𝑥)↑2)):ℕ⟶ℝ)
14		resqrexlemgt0.rr	. . 3 ⊢ (𝜑 → 𝐿 ∈ ℝ)
15	14	resqcld 9406	. 2 ⊢ (𝜑 → (𝐿↑2) ∈ ℝ)
16		resqrexlemgt0.lim	. . . 4 ⊢ (𝜑 → ∀𝑒 ∈ ℝ⁺ ∃𝑗 ∈ ℕ ∀𝑖 ∈ (ℤ_≥‘𝑗)((𝐹‘𝑖) < (𝐿 + 𝑒) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑒)))
17		oveq2 5520	. . . . . . . . 9 ⊢ (𝑒 = 𝑎 → (𝐿 + 𝑒) = (𝐿 + 𝑎))
18	17	breq2d 3776	. . . . . . . 8 ⊢ (𝑒 = 𝑎 → ((𝐹‘𝑖) < (𝐿 + 𝑒) ↔ (𝐹‘𝑖) < (𝐿 + 𝑎)))
19		oveq2 5520	. . . . . . . . 9 ⊢ (𝑒 = 𝑎 → ((𝐹‘𝑖) + 𝑒) = ((𝐹‘𝑖) + 𝑎))
20	19	breq2d 3776	. . . . . . . 8 ⊢ (𝑒 = 𝑎 → (𝐿 < ((𝐹‘𝑖) + 𝑒) ↔ 𝐿 < ((𝐹‘𝑖) + 𝑎)))
21	18, 20	anbi12d 442	. . . . . . 7 ⊢ (𝑒 = 𝑎 → (((𝐹‘𝑖) < (𝐿 + 𝑒) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑒)) ↔ ((𝐹‘𝑖) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑎))))
22	21	rexralbidv 2350	. . . . . 6 ⊢ (𝑒 = 𝑎 → (∃𝑗 ∈ ℕ ∀𝑖 ∈ (ℤ_≥‘𝑗)((𝐹‘𝑖) < (𝐿 + 𝑒) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑒)) ↔ ∃𝑗 ∈ ℕ ∀𝑖 ∈ (ℤ_≥‘𝑗)((𝐹‘𝑖) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑎))))
23	22	cbvralv 2533	. . . . 5 ⊢ (∀𝑒 ∈ ℝ⁺ ∃𝑗 ∈ ℕ ∀𝑖 ∈ (ℤ_≥‘𝑗)((𝐹‘𝑖) < (𝐿 + 𝑒) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑒)) ↔ ∀𝑎 ∈ ℝ⁺ ∃𝑗 ∈ ℕ ∀𝑖 ∈ (ℤ_≥‘𝑗)((𝐹‘𝑖) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑎)))
24		fveq2 5178	. . . . . . . 8 ⊢ (𝑗 = 𝑏 → (ℤ_≥‘𝑗) = (ℤ_≥‘𝑏))
25	24	raleqdv 2511	. . . . . . 7 ⊢ (𝑗 = 𝑏 → (∀𝑖 ∈ (ℤ_≥‘𝑗)((𝐹‘𝑖) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑎)) ↔ ∀𝑖 ∈ (ℤ_≥‘𝑏)((𝐹‘𝑖) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑎))))
26	25	cbvrexv 2534	. . . . . 6 ⊢ (∃𝑗 ∈ ℕ ∀𝑖 ∈ (ℤ_≥‘𝑗)((𝐹‘𝑖) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑎)) ↔ ∃𝑏 ∈ ℕ ∀𝑖 ∈ (ℤ_≥‘𝑏)((𝐹‘𝑖) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑎)))
27	26	ralbii 2330	. . . . 5 ⊢ (∀𝑎 ∈ ℝ⁺ ∃𝑗 ∈ ℕ ∀𝑖 ∈ (ℤ_≥‘𝑗)((𝐹‘𝑖) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑎)) ↔ ∀𝑎 ∈ ℝ⁺ ∃𝑏 ∈ ℕ ∀𝑖 ∈ (ℤ_≥‘𝑏)((𝐹‘𝑖) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑎)))
28		fveq2 5178	. . . . . . . . . 10 ⊢ (𝑖 = 𝑐 → (𝐹‘𝑖) = (𝐹‘𝑐))
29	28	breq1d 3774	. . . . . . . . 9 ⊢ (𝑖 = 𝑐 → ((𝐹‘𝑖) < (𝐿 + 𝑎) ↔ (𝐹‘𝑐) < (𝐿 + 𝑎)))
30	28	oveq1d 5527	. . . . . . . . . 10 ⊢ (𝑖 = 𝑐 → ((𝐹‘𝑖) + 𝑎) = ((𝐹‘𝑐) + 𝑎))
31	30	breq2d 3776	. . . . . . . . 9 ⊢ (𝑖 = 𝑐 → (𝐿 < ((𝐹‘𝑖) + 𝑎) ↔ 𝐿 < ((𝐹‘𝑐) + 𝑎)))
32	29, 31	anbi12d 442	. . . . . . . 8 ⊢ (𝑖 = 𝑐 → (((𝐹‘𝑖) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑎)) ↔ ((𝐹‘𝑐) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑐) + 𝑎))))
33	32	cbvralv 2533	. . . . . . 7 ⊢ (∀𝑖 ∈ (ℤ_≥‘𝑏)((𝐹‘𝑖) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑎)) ↔ ∀𝑐 ∈ (ℤ_≥‘𝑏)((𝐹‘𝑐) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑐) + 𝑎)))
34	33	rexbii 2331	. . . . . 6 ⊢ (∃𝑏 ∈ ℕ ∀𝑖 ∈ (ℤ_≥‘𝑏)((𝐹‘𝑖) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑎)) ↔ ∃𝑏 ∈ ℕ ∀𝑐 ∈ (ℤ_≥‘𝑏)((𝐹‘𝑐) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑐) + 𝑎)))
35	34	ralbii 2330	. . . . 5 ⊢ (∀𝑎 ∈ ℝ⁺ ∃𝑏 ∈ ℕ ∀𝑖 ∈ (ℤ_≥‘𝑏)((𝐹‘𝑖) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑎)) ↔ ∀𝑎 ∈ ℝ⁺ ∃𝑏 ∈ ℕ ∀𝑐 ∈ (ℤ_≥‘𝑏)((𝐹‘𝑐) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑐) + 𝑎)))
36	23, 27, 35	3bitri 195	. . . 4 ⊢ (∀𝑒 ∈ ℝ⁺ ∃𝑗 ∈ ℕ ∀𝑖 ∈ (ℤ_≥‘𝑗)((𝐹‘𝑖) < (𝐿 + 𝑒) ∧ 𝐿 < ((𝐹‘𝑖) + 𝑒)) ↔ ∀𝑎 ∈ ℝ⁺ ∃𝑏 ∈ ℕ ∀𝑐 ∈ (ℤ_≥‘𝑏)((𝐹‘𝑐) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑐) + 𝑎)))
37	16, 36	sylib 127	. . 3 ⊢ (𝜑 → ∀𝑎 ∈ ℝ⁺ ∃𝑏 ∈ ℕ ∀𝑐 ∈ (ℤ_≥‘𝑏)((𝐹‘𝑐) < (𝐿 + 𝑎) ∧ 𝐿 < ((𝐹‘𝑐) + 𝑎)))
38	1, 2, 3, 14, 37, 9	resqrexlemglsq 9620	. 2 ⊢ (𝜑 → ∀𝑎 ∈ ℝ⁺ ∃𝑏 ∈ ℕ ∀𝑑 ∈ (ℤ_≥‘𝑏)(((𝑥 ∈ ℕ ↦ ((𝐹‘𝑥)↑2))‘𝑑) < ((𝐿↑2) + 𝑎) ∧ (𝐿↑2) < (((𝑥 ∈ ℕ ↦ ((𝐹‘𝑥)↑2))‘𝑑) + 𝑎)))
39	1, 2, 3, 14, 37, 9	resqrexlemga 9621	. 2 ⊢ (𝜑 → ∀𝑎 ∈ ℝ⁺ ∃𝑏 ∈ ℕ ∀𝑑 ∈ (ℤ_≥‘𝑏)(((𝑥 ∈ ℕ ↦ ((𝐹‘𝑥)↑2))‘𝑑) < (𝐴 + 𝑎) ∧ 𝐴 < (((𝑥 ∈ ℕ ↦ ((𝐹‘𝑥)↑2))‘𝑑) + 𝑎)))
40	13, 15, 38, 2, 39	recvguniq 9593	1 ⊢ (𝜑 → (𝐿↑2) = 𝐴)

Colors of variables: wff set class

Syntax hints: → wi 4 ∧ wa 97 = wceq 1243 ∈ wcel 1393 ∀wral 2306 ∃wrex 2307 ⊆ wss 2917 {csn 3375 class class class wbr 3764 ↦ cmpt 3818 × cxp 4343 ‘cfv 4902 (class class class)co 5512 ↦ cmpt2 5514 ℝcr 6888 0cc0 6889 1c1 6890 + caddc 6892 < clt 7060 ≤ cle 7061 / cdiv 7651 ℕcn 7914 2c2 7964 ℤcz 8245 ℤ_≥cuz 8473 ℝ⁺crp 8583 seqcseq 9211 ↑cexp 9254

This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-in1 544 ax-in2 545 ax-io 630 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-13 1404 ax-14 1405 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 ax-coll 3872 ax-sep 3875 ax-nul 3883 ax-pow 3927 ax-pr 3944 ax-un 4170 ax-setind 4262 ax-iinf 4311 ax-cnex 6975 ax-resscn 6976 ax-1cn 6977 ax-1re 6978 ax-icn 6979 ax-addcl 6980 ax-addrcl 6981 ax-mulcl 6982 ax-mulrcl 6983 ax-addcom 6984 ax-mulcom 6985 ax-addass 6986 ax-mulass 6987 ax-distr 6988 ax-i2m1 6989 ax-1rid 6991 ax-0id 6992 ax-rnegex 6993 ax-precex 6994 ax-cnre 6995 ax-pre-ltirr 6996 ax-pre-ltwlin 6997 ax-pre-lttrn 6998 ax-pre-apti 6999 ax-pre-ltadd 7000 ax-pre-mulgt0 7001 ax-pre-mulext 7002 ax-arch 7003

This theorem depends on definitions: df-bi 110 df-dc 743 df-3or 886 df-3an 887 df-tru 1246 df-fal 1249 df-nf 1350 df-sb 1646 df-eu 1903 df-mo 1904 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-ne 2206 df-nel 2207 df-ral 2311 df-rex 2312 df-reu 2313 df-rmo 2314 df-rab 2315 df-v 2559 df-sbc 2765 df-csb 2853 df-dif 2920 df-un 2922 df-in 2924 df-ss 2931 df-nul 3225 df-if 3332 df-pw 3361 df-sn 3381 df-pr 3382 df-op 3384 df-uni 3581 df-int 3616 df-iun 3659 df-br 3765 df-opab 3819 df-mpt 3820 df-tr 3855 df-eprel 4026 df-id 4030 df-po 4033 df-iso 4034 df-iord 4103 df-on 4105 df-suc 4108 df-iom 4314 df-xp 4351 df-rel 4352 df-cnv 4353 df-co 4354 df-dm 4355 df-rn 4356 df-res 4357 df-ima 4358 df-iota 4867 df-fun 4904 df-fn 4905 df-f 4906 df-f1 4907 df-fo 4908 df-f1o 4909 df-fv 4910 df-riota 5468 df-ov 5515 df-oprab 5516 df-mpt2 5517 df-1st 5767 df-2nd 5768 df-recs 5920 df-irdg 5957 df-frec 5978 df-1o 6001 df-2o 6002 df-oadd 6005 df-omul 6006 df-er 6106 df-ec 6108 df-qs 6112 df-ni 6402 df-pli 6403 df-mi 6404 df-lti 6405 df-plpq 6442 df-mpq 6443 df-enq 6445 df-nqqs 6446 df-plqqs 6447 df-mqqs 6448 df-1nqqs 6449 df-rq 6450 df-ltnqqs 6451 df-enq0 6522 df-nq0 6523 df-0nq0 6524 df-plq0 6525 df-mq0 6526 df-inp 6564 df-i1p 6565 df-iplp 6566 df-iltp 6568 df-enr 6811 df-nr 6812 df-ltr 6815 df-0r 6816 df-1r 6817 df-0 6896 df-1 6897 df-r 6899 df-lt 6902 df-pnf 7062 df-mnf 7063 df-xr 7064 df-ltxr 7065 df-le 7066 df-sub 7184 df-neg 7185 df-reap 7566 df-ap 7573 df-div 7652 df-inn 7915 df-2 7973 df-3 7974 df-4 7975 df-n0 8182 df-z 8246 df-uz 8474 df-rp 8584 df-iseq 9212 df-iexp 9255

This theorem is referenced by: resqrexlemex 9623

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