Theorem climeqf 46434

Description: Two functions that are eventually equal to one another have the same limit. (Contributed by Glauco Siliprandi, 23-Oct-2021.)

Hypotheses

Ref	Expression
climeqf.p	⊢ Ⅎ𝑘𝜑
climeqf.k	⊢ Ⅎ𝑘𝐹
climeqf.n	⊢ Ⅎ𝑘𝐺
climeqf.m	⊢ (𝜑 → 𝑀 ∈ ℤ)
climeqf.z	⊢ 𝑍 = (ℤ≥‘𝑀)
climeqf.f	⊢ (𝜑 → 𝐹 ∈ 𝑉)
climeqf.g	⊢ (𝜑 → 𝐺 ∈ 𝑊)
climeqf.e	⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) = (𝐺‘𝑘))

Assertion

Ref	Expression
climeqf	⊢ (𝜑 → (𝐹 ⇝ 𝐴 ↔ 𝐺 ⇝ 𝐴))

Distinct variable group:   𝑘,𝑍

Allowed substitution hints:   𝜑(𝑘)   𝐴(𝑘)   𝐹(𝑘)   𝐺(𝑘)   𝑀(𝑘)   𝑉(𝑘)   𝑊(𝑘)

Proof of Theorem climeqf

Dummy variable 𝑗 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		climeqf.z	. 2 ⊢ 𝑍 = (ℤ≥‘𝑀)
2		climeqf.f	. 2 ⊢ (𝜑 → 𝐹 ∈ 𝑉)
3		climeqf.g	. 2 ⊢ (𝜑 → 𝐺 ∈ 𝑊)
4		climeqf.m	. 2 ⊢ (𝜑 → 𝑀 ∈ ℤ)
5		climeqf.p	. . . . 5 ⊢ Ⅎ𝑘𝜑
6		nfv 1947	. . . . 5 ⊢ Ⅎ𝑘 𝑗 ∈ 𝑍
7	5, 6	nfan 1932	. . . 4 ⊢ Ⅎ𝑘(𝜑 ∧ 𝑗 ∈ 𝑍)
8		climeqf.k	. . . . . 6 ⊢ Ⅎ𝑘𝐹
9		nfcv 2928	. . . . . 6 ⊢ Ⅎ𝑘𝑗
10	8, 9	nffv 6895	. . . . 5 ⊢ Ⅎ𝑘(𝐹‘𝑗)
11		climeqf.n	. . . . . 6 ⊢ Ⅎ𝑘𝐺
12	11, 9	nffv 6895	. . . . 5 ⊢ Ⅎ𝑘(𝐺‘𝑗)
13	10, 12	nfeq 2941	. . . 4 ⊢ Ⅎ𝑘(𝐹‘𝑗) = (𝐺‘𝑗)
14	7, 13	nfim 1929	. . 3 ⊢ Ⅎ𝑘((𝜑 ∧ 𝑗 ∈ 𝑍) → (𝐹‘𝑗) = (𝐺‘𝑗))
15		eleq1w 2849	. . . . 5 ⊢ (𝑘 = 𝑗 → (𝑘 ∈ 𝑍 ↔ 𝑗 ∈ 𝑍))
16	15	anbi2d 642	. . . 4 ⊢ (𝑘 = 𝑗 → ((𝜑 ∧ 𝑘 ∈ 𝑍) ↔ (𝜑 ∧ 𝑗 ∈ 𝑍)))
17		fveq2 6885	. . . . 5 ⊢ (𝑘 = 𝑗 → (𝐹‘𝑘) = (𝐹‘𝑗))
18		fveq2 6885	. . . . 5 ⊢ (𝑘 = 𝑗 → (𝐺‘𝑘) = (𝐺‘𝑗))
19	17, 18	eqeq12d 2782	. . . 4 ⊢ (𝑘 = 𝑗 → ((𝐹‘𝑘) = (𝐺‘𝑘) ↔ (𝐹‘𝑗) = (𝐺‘𝑗)))
20	16, 19	imbi12d 347	. . 3 ⊢ (𝑘 = 𝑗 → (((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) = (𝐺‘𝑘)) ↔ ((𝜑 ∧ 𝑗 ∈ 𝑍) → (𝐹‘𝑗) = (𝐺‘𝑗))))
21		climeqf.e	. . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) = (𝐺‘𝑘))
22	14, 20, 21	chvarfv 2279	. 2 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝑍) → (𝐹‘𝑗) = (𝐺‘𝑗))
23	1, 2, 3, 4, 22	climeq 15629	1 ⊢ (𝜑 → (𝐹 ⇝ 𝐴 ↔ 𝐺 ⇝ 𝐴))

This proof depends on syntax axioms:   → wi 4   ↔ wb 209   ∧ wa 401   = wceq 1570  Ⅎwnf 1816   ∈ wcel 2146  Ⅎwnfc 2913   class class class wbr 5112  ‘cfv 6540  ℤcz 12601  ℤ_≥cuz 12872   ⇝ cli 15546

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2738  ax-sep 5260  ax-nul 5272  ax-pow 5339  ax-pr 5407  ax-un 7738  ax-cnex 11166  ax-resscn 11167  ax-pre-lttri 11184  ax-pre-lttrn 11185

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2570  df-eu 2600  df-clab 2745  df-cleq 2758  df-clel 2841  df-nfc 2915  df-ne 2962  df-nel 3068  df-ral 3083  df-rex 3093  df-rab 3420  df-v 3460  df-sbc 3748  df-csb 3857  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-nul 4290  df-if 4491  df-pw 4567  df-sn 4593  df-pr 4595  df-op 4599  df-uni 4876  df-br 5113  df-opab 5177  df-mpt 5196  df-id 5559  df-po 5572  df-so 5573  df-xp 5670  df-rel 5671  df-cnv 5672  df-co 5673  df-dm 5674  df-rn 5675  df-res 5676  df-ima 5677  df-iota 6496  df-fun 6542  df-fn 6543  df-f 6544  df-f1 6545  df-fo 6546  df-f1o 6547  df-fv 6548  df-ov 7419  df-er 8696  df-en 8946  df-dom 8947  df-sdom 8948  df-pnf 11255  df-mnf 11256  df-xr 11257  df-ltxr 11258  df-le 11259  df-neg 11454  df-z 12602  df-uz 12873  df-clim 15550

This theorem is used by:  climeqmpt  46443