cnndvlem2 - Mathbox for Asger C. Ipsen

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Theorem cnndvlem2 36533

Description: Lemma for cnndv 36534. (Contributed by Asger C. Ipsen, 26-Aug-2021.)

**Hypotheses**
Ref	Expression
cnndvlem2.t	⊢ 𝑇 = (𝑥 ∈ ℝ ↦ (abs‘((⌊‘(𝑥 + (1 / 2))) − 𝑥)))
cnndvlem2.f	⊢ 𝐹 = (𝑦 ∈ ℝ ↦ (𝑛 ∈ ℕ₀ ↦ (((1 / 2)↑𝑛) · (𝑇‘(((2 · 3)↑𝑛) · 𝑦)))))
cnndvlem2.w	⊢ 𝑊 = (𝑤 ∈ ℝ ↦ Σ𝑖 ∈ ℕ₀ ((𝐹‘𝑤)‘𝑖))

**Assertion**
Ref	Expression
cnndvlem2	⊢ ∃𝑓(𝑓 ∈ (ℝ–cn→ℝ) ∧ dom (ℝ D 𝑓) = ∅)

Distinct variable groups: 𝑖,𝐹,𝑤 𝑇,𝑛,𝑦 𝑓,𝑊 𝑖,𝑛,𝑦,𝑤 𝑥,𝑖,𝑤 Allowed substitution hints: 𝑇(𝑥,𝑤,𝑓,𝑖) 𝐹(𝑥,𝑦,𝑓,𝑛) 𝑊(𝑥,𝑦,𝑤,𝑖,𝑛)

**Proof of Theorem cnndvlem2**
Step	Hyp	Ref	Expression
1		cnndvlem2.t	. . 3 ⊢ 𝑇 = (𝑥 ∈ ℝ ↦ (abs‘((⌊‘(𝑥 + (1 / 2))) − 𝑥)))
2		cnndvlem2.f	. . 3 ⊢ 𝐹 = (𝑦 ∈ ℝ ↦ (𝑛 ∈ ℕ₀ ↦ (((1 / 2)↑𝑛) · (𝑇‘(((2 · 3)↑𝑛) · 𝑦)))))
3		cnndvlem2.w	. . 3 ⊢ 𝑊 = (𝑤 ∈ ℝ ↦ Σ𝑖 ∈ ℕ₀ ((𝐹‘𝑤)‘𝑖))
4	1, 2, 3	cnndvlem1 36532	. 2 ⊢ (𝑊 ∈ (ℝ–cn→ℝ) ∧ dom (ℝ D 𝑊) = ∅)
5		reex 11250	. . . . 5 ⊢ ℝ ∈ V
6	5	mptex 7247	. . . 4 ⊢ (𝑤 ∈ ℝ ↦ Σ𝑖 ∈ ℕ₀ ((𝐹‘𝑤)‘𝑖)) ∈ V
7	3, 6	eqeltri 2836	. . 3 ⊢ 𝑊 ∈ V
8		eleq1 2828	. . . 4 ⊢ (𝑓 = 𝑊 → (𝑓 ∈ (ℝ–cn→ℝ) ↔ 𝑊 ∈ (ℝ–cn→ℝ)))
9		oveq2 7443	. . . . . 6 ⊢ (𝑓 = 𝑊 → (ℝ D 𝑓) = (ℝ D 𝑊))
10	9	dmeqd 5920	. . . . 5 ⊢ (𝑓 = 𝑊 → dom (ℝ D 𝑓) = dom (ℝ D 𝑊))
11	10	eqeq1d 2738	. . . 4 ⊢ (𝑓 = 𝑊 → (dom (ℝ D 𝑓) = ∅ ↔ dom (ℝ D 𝑊) = ∅))
12	8, 11	anbi12d 632	. . 3 ⊢ (𝑓 = 𝑊 → ((𝑓 ∈ (ℝ–cn→ℝ) ∧ dom (ℝ D 𝑓) = ∅) ↔ (𝑊 ∈ (ℝ–cn→ℝ) ∧ dom (ℝ D 𝑊) = ∅)))
13	7, 12	spcev 3607	. 2 ⊢ ((𝑊 ∈ (ℝ–cn→ℝ) ∧ dom (ℝ D 𝑊) = ∅) → ∃𝑓(𝑓 ∈ (ℝ–cn→ℝ) ∧ dom (ℝ D 𝑓) = ∅))
14	4, 13	ax-mp 5	1 ⊢ ∃𝑓(𝑓 ∈ (ℝ–cn→ℝ) ∧ dom (ℝ D 𝑓) = ∅)

Colors of variables: wff setvar class

Syntax hints: ∧ wa 395 = wceq 1538 ∃wex 1777 ∈ wcel 2107 Vcvv 3479 ∅c0 4340 ↦ cmpt 5232 dom cdm 5690 ‘cfv 6566 (class class class)co 7435 ℝcr 11158 1c1 11160 + caddc 11162 · cmul 11164 − cmin 11496 / cdiv 11924 2c2 12325 3c3 12326 ℕ₀cn0 12530 ⌊cfl 13833 ↑cexp 14105 abscabs 15276 Σcsu 15725 –cn→ccncf 24924 D cdv 25921

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1793 ax-4 1807 ax-5 1909 ax-6 1966 ax-7 2006 ax-8 2109 ax-9 2117 ax-10 2140 ax-11 2156 ax-12 2176 ax-ext 2707 ax-rep 5286 ax-sep 5303 ax-nul 5313 ax-pow 5372 ax-pr 5439 ax-un 7758 ax-inf2 9685 ax-cnex 11215 ax-resscn 11216 ax-1cn 11217 ax-icn 11218 ax-addcl 11219 ax-addrcl 11220 ax-mulcl 11221 ax-mulrcl 11222 ax-mulcom 11223 ax-addass 11224 ax-mulass 11225 ax-distr 11226 ax-i2m1 11227 ax-1ne0 11228 ax-1rid 11229 ax-rnegex 11230 ax-rrecex 11231 ax-cnre 11232 ax-pre-lttri 11233 ax-pre-lttrn 11234 ax-pre-ltadd 11235 ax-pre-mulgt0 11236 ax-pre-sup 11237 ax-addf 11238

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1541 df-fal 1551 df-ex 1778 df-nf 1782 df-sb 2064 df-mo 2539 df-eu 2568 df-clab 2714 df-cleq 2728 df-clel 2815 df-nfc 2891 df-ne 2940 df-nel 3046 df-ral 3061 df-rex 3070 df-rmo 3379 df-reu 3380 df-rab 3435 df-v 3481 df-sbc 3793 df-csb 3910 df-dif 3967 df-un 3969 df-in 3971 df-ss 3981 df-pss 3984 df-nul 4341 df-if 4533 df-pw 4608 df-sn 4633 df-pr 4635 df-tp 4637 df-op 4639 df-uni 4914 df-int 4953 df-iun 4999 df-iin 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5584 df-eprel 5590 df-po 5598 df-so 5599 df-fr 5642 df-se 5643 df-we 5644 df-xp 5696 df-rel 5697 df-cnv 5698 df-co 5699 df-dm 5700 df-rn 5701 df-res 5702 df-ima 5703 df-pred 6326 df-ord 6392 df-on 6393 df-lim 6394 df-suc 6395 df-iota 6519 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 df-isom 6575 df-riota 7392 df-ov 7438 df-oprab 7439 df-mpo 7440 df-of 7701 df-om 7892 df-1st 8019 df-2nd 8020 df-supp 8191 df-frecs 8311 df-wrecs 8342 df-recs 8416 df-rdg 8455 df-1o 8511 df-2o 8512 df-er 8750 df-map 8873 df-pm 8874 df-ixp 8943 df-en 8991 df-dom 8992 df-sdom 8993 df-fin 8994 df-fsupp 9406 df-fi 9455 df-sup 9486 df-inf 9487 df-oi 9554 df-card 9983 df-pnf 11301 df-mnf 11302 df-xr 11303 df-ltxr 11304 df-le 11305 df-sub 11498 df-neg 11499 df-div 11925 df-nn 12271 df-2 12333 df-3 12334 df-4 12335 df-5 12336 df-6 12337 df-7 12338 df-8 12339 df-9 12340 df-n0 12531 df-z 12618 df-dec 12738 df-uz 12883 df-q 12995 df-rp 13039 df-xneg 13158 df-xadd 13159 df-xmul 13160 df-ioo 13394 df-ico 13396 df-icc 13397 df-fz 13551 df-fzo 13698 df-fl 13835 df-seq 14046 df-exp 14106 df-hash 14373 df-cj 15141 df-re 15142 df-im 15143 df-sqrt 15277 df-abs 15278 df-limsup 15510 df-clim 15527 df-rlim 15528 df-sum 15726 df-dvds 16294 df-struct 17187 df-sets 17204 df-slot 17222 df-ndx 17234 df-base 17252 df-ress 17281 df-plusg 17317 df-mulr 17318 df-starv 17319 df-sca 17320 df-vsca 17321 df-ip 17322 df-tset 17323 df-ple 17324 df-ds 17326 df-unif 17327 df-hom 17328 df-cco 17329 df-rest 17475 df-topn 17476 df-0g 17494 df-gsum 17495 df-topgen 17496 df-pt 17497 df-prds 17500 df-xrs 17555 df-qtop 17560 df-imas 17561 df-xps 17563 df-mre 17637 df-mrc 17638 df-acs 17640 df-mgm 18672 df-sgrp 18751 df-mnd 18767 df-submnd 18816 df-mulg 19105 df-cntz 19354 df-cmn 19821 df-psmet 21380 df-xmet 21381 df-met 21382 df-bl 21383 df-mopn 21384 df-cnfld 21389 df-top 22922 df-topon 22939 df-topsp 22961 df-bases 22975 df-ntr 23050 df-cn 23257 df-cnp 23258 df-tx 23592 df-hmeo 23785 df-xms 24352 df-ms 24353 df-tms 24354 df-cncf 24926 df-limc 25924 df-dv 25925 df-ulm 26443

This theorem is referenced by: cnndv 36534

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