ellimcabssub0 - Mathbox for Glauco Siliprandi

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Theorem ellimcabssub0 44320

Description: An equivalent condition for being a limit. (Contributed by Glauco Siliprandi, 11-Dec-2019.)

**Hypotheses**
Ref	Expression
ellimcabssub0.f	⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵)
ellimcabssub0.g	⊢ 𝐺 = (𝑥 ∈ 𝐴 ↦ (𝐵 − 𝐶))
ellimcabssub0.a	⊢ (𝜑 → 𝐴 ⊆ ℂ)
ellimcabssub0.b	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ)
ellimcabssub0.p	⊢ (𝜑 → 𝐷 ∈ ℂ)
ellimcabssub0.c	⊢ (𝜑 → 𝐶 ∈ ℂ)

**Assertion**
Ref	Expression
ellimcabssub0	⊢ (𝜑 → (𝐶 ∈ (𝐹 lim_ℂ 𝐷) ↔ 0 ∈ (𝐺 lim_ℂ 𝐷)))

Distinct variable groups: 𝑥,𝐴 𝑥,𝐶 𝜑,𝑥 Allowed substitution hints: 𝐵(𝑥) 𝐷(𝑥) 𝐹(𝑥) 𝐺(𝑥)

Proof of Theorem ellimcabssub0 Dummy variables 𝑤 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		ellimcabssub0.c	. . . 4 ⊢ (𝜑 → 𝐶 ∈ ℂ)
2		0cnd 11204	. . . 4 ⊢ (𝜑 → 0 ∈ ℂ)
3	1, 2	2thd 265	. . 3 ⊢ (𝜑 → (𝐶 ∈ ℂ ↔ 0 ∈ ℂ))
4		ellimcabssub0.b	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ)
5	1	adantr 482	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ∈ ℂ)
6	4, 5	subcld 11568	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐵 − 𝐶) ∈ ℂ)
7		ellimcabssub0.g	. . . . . . . . . . . . 13 ⊢ 𝐺 = (𝑥 ∈ 𝐴 ↦ (𝐵 − 𝐶))
8	6, 7	fmptd 7111	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝐺:𝐴⟶ℂ)
9	8	ffvelcdmda 7084	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → (𝐺‘𝑧) ∈ ℂ)
10	9	subid1d 11557	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → ((𝐺‘𝑧) − 0) = (𝐺‘𝑧))
11		simpr 486	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → 𝑧 ∈ 𝐴)
12		csbov1g 7451	. . . . . . . . . . . . 13 ⊢ (𝑧 ∈ V → ⦋𝑧 / 𝑥⦌(𝐵 − 𝐶) = (⦋𝑧 / 𝑥⦌𝐵 − 𝐶))
13	12	elv 3481	. . . . . . . . . . . 12 ⊢ ⦋𝑧 / 𝑥⦌(𝐵 − 𝐶) = (⦋𝑧 / 𝑥⦌𝐵 − 𝐶)
14		sban 2084	. . . . . . . . . . . . . . . . 17 ⊢ ([𝑧 / 𝑥](𝜑 ∧ 𝑥 ∈ 𝐴) ↔ ([𝑧 / 𝑥]𝜑 ∧ [𝑧 / 𝑥]𝑥 ∈ 𝐴))
15		nfv 1918	. . . . . . . . . . . . . . . . . . 19 ⊢ Ⅎ𝑥𝜑
16	15	sbf 2263	. . . . . . . . . . . . . . . . . 18 ⊢ ([𝑧 / 𝑥]𝜑 ↔ 𝜑)
17		clelsb1 2861	. . . . . . . . . . . . . . . . . 18 ⊢ ([𝑧 / 𝑥]𝑥 ∈ 𝐴 ↔ 𝑧 ∈ 𝐴)
18	16, 17	anbi12i 628	. . . . . . . . . . . . . . . . 17 ⊢ (([𝑧 / 𝑥]𝜑 ∧ [𝑧 / 𝑥]𝑥 ∈ 𝐴) ↔ (𝜑 ∧ 𝑧 ∈ 𝐴))
19	14, 18	bitri 275	. . . . . . . . . . . . . . . 16 ⊢ ([𝑧 / 𝑥](𝜑 ∧ 𝑥 ∈ 𝐴) ↔ (𝜑 ∧ 𝑧 ∈ 𝐴))
20	4	nfth 1804	. . . . . . . . . . . . . . . . . 18 ⊢ Ⅎ𝑥((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ)
21	20	sbf 2263	. . . . . . . . . . . . . . . . 17 ⊢ ([𝑧 / 𝑥]((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ) ↔ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ))
22		sbim 2300	. . . . . . . . . . . . . . . . 17 ⊢ ([𝑧 / 𝑥]((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ) ↔ ([𝑧 / 𝑥](𝜑 ∧ 𝑥 ∈ 𝐴) → [𝑧 / 𝑥]𝐵 ∈ ℂ))
23	21, 22	sylbb1 236	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ) → ([𝑧 / 𝑥](𝜑 ∧ 𝑥 ∈ 𝐴) → [𝑧 / 𝑥]𝐵 ∈ ℂ))
24	19, 23	biimtrrid 242	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ) → ((𝜑 ∧ 𝑧 ∈ 𝐴) → [𝑧 / 𝑥]𝐵 ∈ ℂ))
25	4, 24	ax-mp 5	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → [𝑧 / 𝑥]𝐵 ∈ ℂ)
26		sbsbc 3781	. . . . . . . . . . . . . . 15 ⊢ ([𝑧 / 𝑥]𝐵 ∈ ℂ ↔ [𝑧 / 𝑥]𝐵 ∈ ℂ)
27		sbcel1g 4413	. . . . . . . . . . . . . . . 16 ⊢ (𝑧 ∈ V → ([𝑧 / 𝑥]𝐵 ∈ ℂ ↔ ⦋𝑧 / 𝑥⦌𝐵 ∈ ℂ))
28	27	elv 3481	. . . . . . . . . . . . . . 15 ⊢ ([𝑧 / 𝑥]𝐵 ∈ ℂ ↔ ⦋𝑧 / 𝑥⦌𝐵 ∈ ℂ)
29	26, 28	bitri 275	. . . . . . . . . . . . . 14 ⊢ ([𝑧 / 𝑥]𝐵 ∈ ℂ ↔ ⦋𝑧 / 𝑥⦌𝐵 ∈ ℂ)
30	25, 29	sylib 217	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → ⦋𝑧 / 𝑥⦌𝐵 ∈ ℂ)
31	1	adantr 482	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → 𝐶 ∈ ℂ)
32	30, 31	subcld 11568	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → (⦋𝑧 / 𝑥⦌𝐵 − 𝐶) ∈ ℂ)
33	13, 32	eqeltrid 2838	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → ⦋𝑧 / 𝑥⦌(𝐵 − 𝐶) ∈ ℂ)
34	7	fvmpts 6999	. . . . . . . . . . 11 ⊢ ((𝑧 ∈ 𝐴 ∧ ⦋𝑧 / 𝑥⦌(𝐵 − 𝐶) ∈ ℂ) → (𝐺‘𝑧) = ⦋𝑧 / 𝑥⦌(𝐵 − 𝐶))
35	11, 33, 34	syl2anc 585	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → (𝐺‘𝑧) = ⦋𝑧 / 𝑥⦌(𝐵 − 𝐶))
36		ellimcabssub0.f	. . . . . . . . . . . . . 14 ⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵)
37	36	fvmpts 6999	. . . . . . . . . . . . 13 ⊢ ((𝑧 ∈ 𝐴 ∧ ⦋𝑧 / 𝑥⦌𝐵 ∈ ℂ) → (𝐹‘𝑧) = ⦋𝑧 / 𝑥⦌𝐵)
38	11, 30, 37	syl2anc 585	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → (𝐹‘𝑧) = ⦋𝑧 / 𝑥⦌𝐵)
39	38	oveq1d 7421	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → ((𝐹‘𝑧) − 𝐶) = (⦋𝑧 / 𝑥⦌𝐵 − 𝐶))
40	13, 39	eqtr4id 2792	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → ⦋𝑧 / 𝑥⦌(𝐵 − 𝐶) = ((𝐹‘𝑧) − 𝐶))
41	10, 35, 40	3eqtrrd 2778	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → ((𝐹‘𝑧) − 𝐶) = ((𝐺‘𝑧) − 0))
42	41	fveq2d 6893	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → (abs‘((𝐹‘𝑧) − 𝐶)) = (abs‘((𝐺‘𝑧) − 0)))
43	42	breq1d 5158	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → ((abs‘((𝐹‘𝑧) − 𝐶)) < 𝑦 ↔ (abs‘((𝐺‘𝑧) − 0)) < 𝑦))
44	43	imbi2d 341	. . . . . 6 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → (((𝑧 ≠ 𝐷 ∧ (abs‘(𝑧 − 𝐷)) < 𝑤) → (abs‘((𝐹‘𝑧) − 𝐶)) < 𝑦) ↔ ((𝑧 ≠ 𝐷 ∧ (abs‘(𝑧 − 𝐷)) < 𝑤) → (abs‘((𝐺‘𝑧) − 0)) < 𝑦)))
45	44	ralbidva 3176	. . . . 5 ⊢ (𝜑 → (∀𝑧 ∈ 𝐴 ((𝑧 ≠ 𝐷 ∧ (abs‘(𝑧 − 𝐷)) < 𝑤) → (abs‘((𝐹‘𝑧) − 𝐶)) < 𝑦) ↔ ∀𝑧 ∈ 𝐴 ((𝑧 ≠ 𝐷 ∧ (abs‘(𝑧 − 𝐷)) < 𝑤) → (abs‘((𝐺‘𝑧) − 0)) < 𝑦)))
46	45	rexbidv 3179	. . . 4 ⊢ (𝜑 → (∃𝑤 ∈ ℝ⁺ ∀𝑧 ∈ 𝐴 ((𝑧 ≠ 𝐷 ∧ (abs‘(𝑧 − 𝐷)) < 𝑤) → (abs‘((𝐹‘𝑧) − 𝐶)) < 𝑦) ↔ ∃𝑤 ∈ ℝ⁺ ∀𝑧 ∈ 𝐴 ((𝑧 ≠ 𝐷 ∧ (abs‘(𝑧 − 𝐷)) < 𝑤) → (abs‘((𝐺‘𝑧) − 0)) < 𝑦)))
47	46	ralbidv 3178	. . 3 ⊢ (𝜑 → (∀𝑦 ∈ ℝ⁺ ∃𝑤 ∈ ℝ⁺ ∀𝑧 ∈ 𝐴 ((𝑧 ≠ 𝐷 ∧ (abs‘(𝑧 − 𝐷)) < 𝑤) → (abs‘((𝐹‘𝑧) − 𝐶)) < 𝑦) ↔ ∀𝑦 ∈ ℝ⁺ ∃𝑤 ∈ ℝ⁺ ∀𝑧 ∈ 𝐴 ((𝑧 ≠ 𝐷 ∧ (abs‘(𝑧 − 𝐷)) < 𝑤) → (abs‘((𝐺‘𝑧) − 0)) < 𝑦)))
48	3, 47	anbi12d 632	. 2 ⊢ (𝜑 → ((𝐶 ∈ ℂ ∧ ∀𝑦 ∈ ℝ⁺ ∃𝑤 ∈ ℝ⁺ ∀𝑧 ∈ 𝐴 ((𝑧 ≠ 𝐷 ∧ (abs‘(𝑧 − 𝐷)) < 𝑤) → (abs‘((𝐹‘𝑧) − 𝐶)) < 𝑦)) ↔ (0 ∈ ℂ ∧ ∀𝑦 ∈ ℝ⁺ ∃𝑤 ∈ ℝ⁺ ∀𝑧 ∈ 𝐴 ((𝑧 ≠ 𝐷 ∧ (abs‘(𝑧 − 𝐷)) < 𝑤) → (abs‘((𝐺‘𝑧) − 0)) < 𝑦))))
49	4, 36	fmptd 7111	. . 3 ⊢ (𝜑 → 𝐹:𝐴⟶ℂ)
50		ellimcabssub0.a	. . 3 ⊢ (𝜑 → 𝐴 ⊆ ℂ)
51		ellimcabssub0.p	. . 3 ⊢ (𝜑 → 𝐷 ∈ ℂ)
52	49, 50, 51	ellimc3 25388	. 2 ⊢ (𝜑 → (𝐶 ∈ (𝐹 lim_ℂ 𝐷) ↔ (𝐶 ∈ ℂ ∧ ∀𝑦 ∈ ℝ⁺ ∃𝑤 ∈ ℝ⁺ ∀𝑧 ∈ 𝐴 ((𝑧 ≠ 𝐷 ∧ (abs‘(𝑧 − 𝐷)) < 𝑤) → (abs‘((𝐹‘𝑧) − 𝐶)) < 𝑦))))
53	8, 50, 51	ellimc3 25388	. 2 ⊢ (𝜑 → (0 ∈ (𝐺 lim_ℂ 𝐷) ↔ (0 ∈ ℂ ∧ ∀𝑦 ∈ ℝ⁺ ∃𝑤 ∈ ℝ⁺ ∀𝑧 ∈ 𝐴 ((𝑧 ≠ 𝐷 ∧ (abs‘(𝑧 − 𝐷)) < 𝑤) → (abs‘((𝐺‘𝑧) − 0)) < 𝑦))))
54	48, 52, 53	3bitr4d 311	1 ⊢ (𝜑 → (𝐶 ∈ (𝐹 lim_ℂ 𝐷) ↔ 0 ∈ (𝐺 lim_ℂ 𝐷)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 397 = wceq 1542 [wsb 2068 ∈ wcel 2107 ≠ wne 2941 ∀wral 3062 ∃wrex 3071 Vcvv 3475 [wsbc 3777 ⦋csb 3893 ⊆ wss 3948 class class class wbr 5148 ↦ cmpt 5231 ‘cfv 6541 (class class class)co 7406 ℂcc 11105 0cc0 11107 < clt 11245 − cmin 11441 ℝ⁺crp 12971 abscabs 15178 lim_ℂ climc 25371

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7722 ax-cnex 11163 ax-resscn 11164 ax-1cn 11165 ax-icn 11166 ax-addcl 11167 ax-addrcl 11168 ax-mulcl 11169 ax-mulrcl 11170 ax-mulcom 11171 ax-addass 11172 ax-mulass 11173 ax-distr 11174 ax-i2m1 11175 ax-1ne0 11176 ax-1rid 11177 ax-rnegex 11178 ax-rrecex 11179 ax-cnre 11180 ax-pre-lttri 11181 ax-pre-lttrn 11182 ax-pre-ltadd 11183 ax-pre-mulgt0 11184 ax-pre-sup 11185

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-tp 4633 df-op 4635 df-uni 4909 df-int 4951 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6298 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6493 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 df-riota 7362 df-ov 7409 df-oprab 7410 df-mpo 7411 df-om 7853 df-1st 7972 df-2nd 7973 df-frecs 8263 df-wrecs 8294 df-recs 8368 df-rdg 8407 df-1o 8463 df-er 8700 df-map 8819 df-pm 8820 df-en 8937 df-dom 8938 df-sdom 8939 df-fin 8940 df-fi 9403 df-sup 9434 df-inf 9435 df-pnf 11247 df-mnf 11248 df-xr 11249 df-ltxr 11250 df-le 11251 df-sub 11443 df-neg 11444 df-div 11869 df-nn 12210 df-2 12272 df-3 12273 df-4 12274 df-5 12275 df-6 12276 df-7 12277 df-8 12278 df-9 12279 df-n0 12470 df-z 12556 df-dec 12675 df-uz 12820 df-q 12930 df-rp 12972 df-xneg 13089 df-xadd 13090 df-xmul 13091 df-fz 13482 df-seq 13964 df-exp 14025 df-cj 15043 df-re 15044 df-im 15045 df-sqrt 15179 df-abs 15180 df-struct 17077 df-slot 17112 df-ndx 17124 df-base 17142 df-plusg 17207 df-mulr 17208 df-starv 17209 df-tset 17213 df-ple 17214 df-ds 17216 df-unif 17217 df-rest 17365 df-topn 17366 df-topgen 17386 df-psmet 20929 df-xmet 20930 df-met 20931 df-bl 20932 df-mopn 20933 df-cnfld 20938 df-top 22388 df-topon 22405 df-topsp 22427 df-bases 22441 df-cnp 22724 df-xms 23818 df-ms 23819 df-limc 25375

This theorem is referenced by: reclimc 44356

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