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Theorem evthicc 25376

Description: Specialization of the Extreme Value Theorem to a closed interval of ℝ. (Contributed by Mario Carneiro, 12-Aug-2014.)

**Hypotheses**
Ref	Expression
evthicc.1	⊢ (𝜑 → 𝐴 ∈ ℝ)
evthicc.2	⊢ (𝜑 → 𝐵 ∈ ℝ)
evthicc.3	⊢ (𝜑 → 𝐴 ≤ 𝐵)
evthicc.4	⊢ (𝜑 → 𝐹 ∈ ((𝐴[,]𝐵)–cn→ℝ))

**Assertion**
Ref	Expression
evthicc	⊢ (𝜑 → (∃𝑥 ∈ (𝐴[,]𝐵)∀𝑦 ∈ (𝐴[,]𝐵)(𝐹‘𝑦) ≤ (𝐹‘𝑥) ∧ ∃𝑧 ∈ (𝐴[,]𝐵)∀𝑤 ∈ (𝐴[,]𝐵)(𝐹‘𝑧) ≤ (𝐹‘𝑤)))

Distinct variable groups: 𝑥,𝑦,𝐴 𝑧,𝑤,𝐴 𝑥,𝐵,𝑦 𝑤,𝐵,𝑧 𝑥,𝐹,𝑦 𝜑,𝑥,𝑦 𝜑,𝑤,𝑧 𝑤,𝐹,𝑧

**Proof of Theorem evthicc**
Step	Hyp	Ref	Expression
1		eqid 2729	. . . 4 ⊢ ∪ ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵)) = ∪ ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵))
2		eqid 2729	. . . 4 ⊢ (topGen‘ran (,)) = (topGen‘ran (,))
3		evthicc.1	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ ℝ)
4		evthicc.2	. . . . 5 ⊢ (𝜑 → 𝐵 ∈ ℝ)
5		eqid 2729	. . . . . 6 ⊢ ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵)) = ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵))
6	2, 5	icccmp 24730	. . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵)) ∈ Comp)
7	3, 4, 6	syl2anc 584	. . . 4 ⊢ (𝜑 → ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵)) ∈ Comp)
8		evthicc.4	. . . . 5 ⊢ (𝜑 → 𝐹 ∈ ((𝐴[,]𝐵)–cn→ℝ))
9		iccssre 13350	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴[,]𝐵) ⊆ ℝ)
10	3, 4, 9	syl2anc 584	. . . . . . . 8 ⊢ (𝜑 → (𝐴[,]𝐵) ⊆ ℝ)
11		ax-resscn 11085	. . . . . . . 8 ⊢ ℝ ⊆ ℂ
12	10, 11	sstrdi 3950	. . . . . . 7 ⊢ (𝜑 → (𝐴[,]𝐵) ⊆ ℂ)
13		eqid 2729	. . . . . . . 8 ⊢ ((abs ∘ − ) ↾ ((𝐴[,]𝐵) × (𝐴[,]𝐵))) = ((abs ∘ − ) ↾ ((𝐴[,]𝐵) × (𝐴[,]𝐵)))
14		eqid 2729	. . . . . . . 8 ⊢ ((abs ∘ − ) ↾ (ℝ × ℝ)) = ((abs ∘ − ) ↾ (ℝ × ℝ))
15		eqid 2729	. . . . . . . 8 ⊢ (MetOpen‘((abs ∘ − ) ↾ ((𝐴[,]𝐵) × (𝐴[,]𝐵)))) = (MetOpen‘((abs ∘ − ) ↾ ((𝐴[,]𝐵) × (𝐴[,]𝐵))))
16		eqid 2729	. . . . . . . . 9 ⊢ (MetOpen‘((abs ∘ − ) ↾ (ℝ × ℝ))) = (MetOpen‘((abs ∘ − ) ↾ (ℝ × ℝ)))
17	14, 16	tgioo 24700	. . . . . . . 8 ⊢ (topGen‘ran (,)) = (MetOpen‘((abs ∘ − ) ↾ (ℝ × ℝ)))
18	13, 14, 15, 17	cncfmet 24818	. . . . . . 7 ⊢ (((𝐴[,]𝐵) ⊆ ℂ ∧ ℝ ⊆ ℂ) → ((𝐴[,]𝐵)–cn→ℝ) = ((MetOpen‘((abs ∘ − ) ↾ ((𝐴[,]𝐵) × (𝐴[,]𝐵)))) Cn (topGen‘ran (,))))
19	12, 11, 18	sylancl 586	. . . . . 6 ⊢ (𝜑 → ((𝐴[,]𝐵)–cn→ℝ) = ((MetOpen‘((abs ∘ − ) ↾ ((𝐴[,]𝐵) × (𝐴[,]𝐵)))) Cn (topGen‘ran (,))))
20	2, 15	resubmet 24706	. . . . . . . 8 ⊢ ((𝐴[,]𝐵) ⊆ ℝ → (MetOpen‘((abs ∘ − ) ↾ ((𝐴[,]𝐵) × (𝐴[,]𝐵)))) = ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵)))
21	10, 20	syl 17	. . . . . . 7 ⊢ (𝜑 → (MetOpen‘((abs ∘ − ) ↾ ((𝐴[,]𝐵) × (𝐴[,]𝐵)))) = ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵)))
22	21	oveq1d 7368	. . . . . 6 ⊢ (𝜑 → ((MetOpen‘((abs ∘ − ) ↾ ((𝐴[,]𝐵) × (𝐴[,]𝐵)))) Cn (topGen‘ran (,))) = (((topGen‘ran (,)) ↾_t (𝐴[,]𝐵)) Cn (topGen‘ran (,))))
23	19, 22	eqtrd 2764	. . . . 5 ⊢ (𝜑 → ((𝐴[,]𝐵)–cn→ℝ) = (((topGen‘ran (,)) ↾_t (𝐴[,]𝐵)) Cn (topGen‘ran (,))))
24	8, 23	eleqtrd 2830	. . . 4 ⊢ (𝜑 → 𝐹 ∈ (((topGen‘ran (,)) ↾_t (𝐴[,]𝐵)) Cn (topGen‘ran (,))))
25		retop 24665	. . . . . 6 ⊢ (topGen‘ran (,)) ∈ Top
26		uniretop 24666	. . . . . . 7 ⊢ ℝ = ∪ (topGen‘ran (,))
27	26	restuni 23065	. . . . . 6 ⊢ (((topGen‘ran (,)) ∈ Top ∧ (𝐴[,]𝐵) ⊆ ℝ) → (𝐴[,]𝐵) = ∪ ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵)))
28	25, 10, 27	sylancr 587	. . . . 5 ⊢ (𝜑 → (𝐴[,]𝐵) = ∪ ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵)))
29	3	rexrd 11184	. . . . . . 7 ⊢ (𝜑 → 𝐴 ∈ ℝ^*)
30	4	rexrd 11184	. . . . . . 7 ⊢ (𝜑 → 𝐵 ∈ ℝ^*)
31		evthicc.3	. . . . . . 7 ⊢ (𝜑 → 𝐴 ≤ 𝐵)
32		lbicc2 13385	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 ≤ 𝐵) → 𝐴 ∈ (𝐴[,]𝐵))
33	29, 30, 31, 32	syl3anc 1373	. . . . . 6 ⊢ (𝜑 → 𝐴 ∈ (𝐴[,]𝐵))
34	33	ne0d 4295	. . . . 5 ⊢ (𝜑 → (𝐴[,]𝐵) ≠ ∅)
35	28, 34	eqnetrrd 2993	. . . 4 ⊢ (𝜑 → ∪ ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵)) ≠ ∅)
36	1, 2, 7, 24, 35	evth 24874	. . 3 ⊢ (𝜑 → ∃𝑥 ∈ ∪ ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵))∀𝑦 ∈ ∪ ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵))(𝐹‘𝑦) ≤ (𝐹‘𝑥))
37	28	raleqdv 3290	. . . 4 ⊢ (𝜑 → (∀𝑦 ∈ (𝐴[,]𝐵)(𝐹‘𝑦) ≤ (𝐹‘𝑥) ↔ ∀𝑦 ∈ ∪ ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵))(𝐹‘𝑦) ≤ (𝐹‘𝑥)))
38	28, 37	rexeqbidv 3311	. . 3 ⊢ (𝜑 → (∃𝑥 ∈ (𝐴[,]𝐵)∀𝑦 ∈ (𝐴[,]𝐵)(𝐹‘𝑦) ≤ (𝐹‘𝑥) ↔ ∃𝑥 ∈ ∪ ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵))∀𝑦 ∈ ∪ ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵))(𝐹‘𝑦) ≤ (𝐹‘𝑥)))
39	36, 38	mpbird 257	. 2 ⊢ (𝜑 → ∃𝑥 ∈ (𝐴[,]𝐵)∀𝑦 ∈ (𝐴[,]𝐵)(𝐹‘𝑦) ≤ (𝐹‘𝑥))
40	1, 2, 7, 24, 35	evth2 24875	. . 3 ⊢ (𝜑 → ∃𝑧 ∈ ∪ ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵))∀𝑤 ∈ ∪ ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵))(𝐹‘𝑧) ≤ (𝐹‘𝑤))
41	28	raleqdv 3290	. . . 4 ⊢ (𝜑 → (∀𝑤 ∈ (𝐴[,]𝐵)(𝐹‘𝑧) ≤ (𝐹‘𝑤) ↔ ∀𝑤 ∈ ∪ ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵))(𝐹‘𝑧) ≤ (𝐹‘𝑤)))
42	28, 41	rexeqbidv 3311	. . 3 ⊢ (𝜑 → (∃𝑧 ∈ (𝐴[,]𝐵)∀𝑤 ∈ (𝐴[,]𝐵)(𝐹‘𝑧) ≤ (𝐹‘𝑤) ↔ ∃𝑧 ∈ ∪ ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵))∀𝑤 ∈ ∪ ((topGen‘ran (,)) ↾_t (𝐴[,]𝐵))(𝐹‘𝑧) ≤ (𝐹‘𝑤)))
43	40, 42	mpbird 257	. 2 ⊢ (𝜑 → ∃𝑧 ∈ (𝐴[,]𝐵)∀𝑤 ∈ (𝐴[,]𝐵)(𝐹‘𝑧) ≤ (𝐹‘𝑤))
44	39, 43	jca 511	1 ⊢ (𝜑 → (∃𝑥 ∈ (𝐴[,]𝐵)∀𝑦 ∈ (𝐴[,]𝐵)(𝐹‘𝑦) ≤ (𝐹‘𝑥) ∧ ∃𝑧 ∈ (𝐴[,]𝐵)∀𝑤 ∈ (𝐴[,]𝐵)(𝐹‘𝑧) ≤ (𝐹‘𝑤)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1540 ∈ wcel 2109 ∀wral 3044 ∃wrex 3053 ⊆ wss 3905 ∅c0 4286 ∪ cuni 4861 class class class wbr 5095 × cxp 5621 ran crn 5624 ↾ cres 5625 ∘ ccom 5627 ‘cfv 6486 (class class class)co 7353 ℂcc 11026 ℝcr 11027 ℝ^*cxr 11167 ≤ cle 11169 − cmin 11365 (,)cioo 13266 [,]cicc 13269 abscabs 15159 ↾_t crest 17342 topGenctg 17359 MetOpencmopn 21269 Topctop 22796 Cn ccn 23127 Compccmp 23289 –cn→ccncf 24785

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-rep 5221 ax-sep 5238 ax-nul 5248 ax-pow 5307 ax-pr 5374 ax-un 7675 ax-cnex 11084 ax-resscn 11085 ax-1cn 11086 ax-icn 11087 ax-addcl 11088 ax-addrcl 11089 ax-mulcl 11090 ax-mulrcl 11091 ax-mulcom 11092 ax-addass 11093 ax-mulass 11094 ax-distr 11095 ax-i2m1 11096 ax-1ne0 11097 ax-1rid 11098 ax-rnegex 11099 ax-rrecex 11100 ax-cnre 11101 ax-pre-lttri 11102 ax-pre-lttrn 11103 ax-pre-ltadd 11104 ax-pre-mulgt0 11105 ax-pre-sup 11106

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3345 df-reu 3346 df-rab 3397 df-v 3440 df-sbc 3745 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-pss 3925 df-nul 4287 df-if 4479 df-pw 4555 df-sn 4580 df-pr 4582 df-tp 4584 df-op 4586 df-uni 4862 df-int 4900 df-iun 4946 df-iin 4947 df-br 5096 df-opab 5158 df-mpt 5177 df-tr 5203 df-id 5518 df-eprel 5523 df-po 5531 df-so 5532 df-fr 5576 df-se 5577 df-we 5578 df-xp 5629 df-rel 5630 df-cnv 5631 df-co 5632 df-dm 5633 df-rn 5634 df-res 5635 df-ima 5636 df-pred 6253 df-ord 6314 df-on 6315 df-lim 6316 df-suc 6317 df-iota 6442 df-fun 6488 df-fn 6489 df-f 6490 df-f1 6491 df-fo 6492 df-f1o 6493 df-fv 6494 df-isom 6495 df-riota 7310 df-ov 7356 df-oprab 7357 df-mpo 7358 df-of 7617 df-om 7807 df-1st 7931 df-2nd 7932 df-supp 8101 df-frecs 8221 df-wrecs 8252 df-recs 8301 df-rdg 8339 df-1o 8395 df-2o 8396 df-er 8632 df-map 8762 df-ixp 8832 df-en 8880 df-dom 8881 df-sdom 8882 df-fin 8883 df-fsupp 9271 df-fi 9320 df-sup 9351 df-inf 9352 df-oi 9421 df-card 9854 df-pnf 11170 df-mnf 11171 df-xr 11172 df-ltxr 11173 df-le 11174 df-sub 11367 df-neg 11368 df-div 11796 df-nn 12147 df-2 12209 df-3 12210 df-4 12211 df-5 12212 df-6 12213 df-7 12214 df-8 12215 df-9 12216 df-n0 12403 df-z 12490 df-dec 12610 df-uz 12754 df-q 12868 df-rp 12912 df-xneg 13032 df-xadd 13033 df-xmul 13034 df-ioo 13270 df-icc 13273 df-fz 13429 df-fzo 13576 df-seq 13927 df-exp 13987 df-hash 14256 df-cj 15024 df-re 15025 df-im 15026 df-sqrt 15160 df-abs 15161 df-struct 17076 df-sets 17093 df-slot 17111 df-ndx 17123 df-base 17139 df-ress 17160 df-plusg 17192 df-mulr 17193 df-starv 17194 df-sca 17195 df-vsca 17196 df-ip 17197 df-tset 17198 df-ple 17199 df-ds 17201 df-unif 17202 df-hom 17203 df-cco 17204 df-rest 17344 df-topn 17345 df-0g 17363 df-gsum 17364 df-topgen 17365 df-pt 17366 df-prds 17369 df-xrs 17424 df-qtop 17429 df-imas 17430 df-xps 17432 df-mre 17506 df-mrc 17507 df-acs 17509 df-mgm 18532 df-sgrp 18611 df-mnd 18627 df-submnd 18676 df-mulg 18965 df-cntz 19214 df-cmn 19679 df-psmet 21271 df-xmet 21272 df-met 21273 df-bl 21274 df-mopn 21275 df-cnfld 21280 df-top 22797 df-topon 22814 df-topsp 22836 df-bases 22849 df-cn 23130 df-cnp 23131 df-cmp 23290 df-tx 23465 df-hmeo 23658 df-xms 24224 df-ms 24225 df-tms 24226 df-cncf 24787

This theorem is referenced by: evthicc2 25377 cniccbdd 25378 rolle 25910 dvivthlem1 25929 itgsubst 25972 evthiccabs 45481 cncficcgt0 45873

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