suprzclex - Intuitionistic Logic Explorer

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Theorem suprzclex 9289

Description: The supremum of a set of integers is an element of the set. (Contributed by Jim Kingdon, 20-Dec-2021.)

**Hypotheses**
Ref	Expression
suprzclex.ex	⊢ (𝜑 → ∃𝑥 ∈ ℝ (∀𝑦 ∈ 𝐴 ¬ 𝑥 < 𝑦 ∧ ∀𝑦 ∈ ℝ (𝑦 < 𝑥 → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧)))
suprzclex.ss	⊢ (𝜑 → 𝐴 ⊆ ℤ)

**Assertion**
Ref	Expression
suprzclex	⊢ (𝜑 → sup(𝐴, ℝ, < ) ∈ 𝐴)

Distinct variable groups: 𝑥,𝐴,𝑦,𝑧 𝜑,𝑥,𝑧 Allowed substitution hint: 𝜑(𝑦)

Proof of Theorem suprzclex Dummy variables 𝑤 𝑓 𝑔 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		lttri3 7978	. . . . . 6 ⊢ ((𝑓 ∈ ℝ ∧ 𝑔 ∈ ℝ) → (𝑓 = 𝑔 ↔ (¬ 𝑓 < 𝑔 ∧ ¬ 𝑔 < 𝑓)))
2	1	adantl 275	. . . . 5 ⊢ ((𝜑 ∧ (𝑓 ∈ ℝ ∧ 𝑔 ∈ ℝ)) → (𝑓 = 𝑔 ↔ (¬ 𝑓 < 𝑔 ∧ ¬ 𝑔 < 𝑓)))
3		suprzclex.ex	. . . . 5 ⊢ (𝜑 → ∃𝑥 ∈ ℝ (∀𝑦 ∈ 𝐴 ¬ 𝑥 < 𝑦 ∧ ∀𝑦 ∈ ℝ (𝑦 < 𝑥 → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧)))
4	2, 3	supclti 6963	. . . 4 ⊢ (𝜑 → sup(𝐴, ℝ, < ) ∈ ℝ)
5	4	ltm1d 8827	. . 3 ⊢ (𝜑 → (sup(𝐴, ℝ, < ) − 1) < sup(𝐴, ℝ, < ))
6		suprzclex.ss	. . . . 5 ⊢ (𝜑 → 𝐴 ⊆ ℤ)
7		zssre 9198	. . . . 5 ⊢ ℤ ⊆ ℝ
8	6, 7	sstrdi 3154	. . . 4 ⊢ (𝜑 → 𝐴 ⊆ ℝ)
9		peano2rem 8165	. . . . 5 ⊢ (sup(𝐴, ℝ, < ) ∈ ℝ → (sup(𝐴, ℝ, < ) − 1) ∈ ℝ)
10	4, 9	syl 14	. . . 4 ⊢ (𝜑 → (sup(𝐴, ℝ, < ) − 1) ∈ ℝ)
11	3, 8, 10	suprlubex 8847	. . 3 ⊢ (𝜑 → ((sup(𝐴, ℝ, < ) − 1) < sup(𝐴, ℝ, < ) ↔ ∃𝑧 ∈ 𝐴 (sup(𝐴, ℝ, < ) − 1) < 𝑧))
12	5, 11	mpbid 146	. 2 ⊢ (𝜑 → ∃𝑧 ∈ 𝐴 (sup(𝐴, ℝ, < ) − 1) < 𝑧)
13	6	adantr 274	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 𝐴 ⊆ ℤ)
14	13	sselda 3142	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝑤 ∈ ℤ)
15	7, 14	sselid 3140	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝑤 ∈ ℝ)
16	4	adantr 274	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → sup(𝐴, ℝ, < ) ∈ ℝ)
17	16	adantr 274	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → sup(𝐴, ℝ, < ) ∈ ℝ)
18		simprl 521	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 𝑧 ∈ 𝐴)
19	13, 18	sseldd 3143	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 𝑧 ∈ ℤ)
20		zre 9195	. . . . . . . . . . 11 ⊢ (𝑧 ∈ ℤ → 𝑧 ∈ ℝ)
21	19, 20	syl 14	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 𝑧 ∈ ℝ)
22		peano2re 8034	. . . . . . . . . 10 ⊢ (𝑧 ∈ ℝ → (𝑧 + 1) ∈ ℝ)
23	21, 22	syl 14	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → (𝑧 + 1) ∈ ℝ)
24	23	adantr 274	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → (𝑧 + 1) ∈ ℝ)
25	3	ad2antrr 480	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → ∃𝑥 ∈ ℝ (∀𝑦 ∈ 𝐴 ¬ 𝑥 < 𝑦 ∧ ∀𝑦 ∈ ℝ (𝑦 < 𝑥 → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧)))
26	8	ad2antrr 480	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝐴 ⊆ ℝ)
27		simpr 109	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝑤 ∈ 𝐴)
28	25, 26, 27	suprubex 8846	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝑤 ≤ sup(𝐴, ℝ, < ))
29		simprr 522	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → (sup(𝐴, ℝ, < ) − 1) < 𝑧)
30		1red 7914	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 1 ∈ ℝ)
31	16, 30, 21	ltsubaddd 8439	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → ((sup(𝐴, ℝ, < ) − 1) < 𝑧 ↔ sup(𝐴, ℝ, < ) < (𝑧 + 1)))
32	29, 31	mpbid 146	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → sup(𝐴, ℝ, < ) < (𝑧 + 1))
33	32	adantr 274	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → sup(𝐴, ℝ, < ) < (𝑧 + 1))
34	15, 17, 24, 28, 33	lelttrd 8023	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝑤 < (𝑧 + 1))
35	19	adantr 274	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝑧 ∈ ℤ)
36		zleltp1 9246	. . . . . . . 8 ⊢ ((𝑤 ∈ ℤ ∧ 𝑧 ∈ ℤ) → (𝑤 ≤ 𝑧 ↔ 𝑤 < (𝑧 + 1)))
37	14, 35, 36	syl2anc 409	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → (𝑤 ≤ 𝑧 ↔ 𝑤 < (𝑧 + 1)))
38	34, 37	mpbird 166	. . . . . 6 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝑤 ≤ 𝑧)
39	38	ralrimiva 2539	. . . . 5 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → ∀𝑤 ∈ 𝐴 𝑤 ≤ 𝑧)
40		breq2 3986	. . . . . . . . . . . . 13 ⊢ (𝑧 = 𝑤 → (𝑦 < 𝑧 ↔ 𝑦 < 𝑤))
41	40	cbvrexv 2693	. . . . . . . . . . . 12 ⊢ (∃𝑧 ∈ 𝐴 𝑦 < 𝑧 ↔ ∃𝑤 ∈ 𝐴 𝑦 < 𝑤)
42	41	imbi2i 225	. . . . . . . . . . 11 ⊢ ((𝑦 < 𝑥 → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧) ↔ (𝑦 < 𝑥 → ∃𝑤 ∈ 𝐴 𝑦 < 𝑤))
43	42	ralbii 2472	. . . . . . . . . 10 ⊢ (∀𝑦 ∈ ℝ (𝑦 < 𝑥 → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧) ↔ ∀𝑦 ∈ ℝ (𝑦 < 𝑥 → ∃𝑤 ∈ 𝐴 𝑦 < 𝑤))
44	43	anbi2i 453	. . . . . . . . 9 ⊢ ((∀𝑦 ∈ 𝐴 ¬ 𝑥 < 𝑦 ∧ ∀𝑦 ∈ ℝ (𝑦 < 𝑥 → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧)) ↔ (∀𝑦 ∈ 𝐴 ¬ 𝑥 < 𝑦 ∧ ∀𝑦 ∈ ℝ (𝑦 < 𝑥 → ∃𝑤 ∈ 𝐴 𝑦 < 𝑤)))
45	44	rexbii 2473	. . . . . . . 8 ⊢ (∃𝑥 ∈ ℝ (∀𝑦 ∈ 𝐴 ¬ 𝑥 < 𝑦 ∧ ∀𝑦 ∈ ℝ (𝑦 < 𝑥 → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧)) ↔ ∃𝑥 ∈ ℝ (∀𝑦 ∈ 𝐴 ¬ 𝑥 < 𝑦 ∧ ∀𝑦 ∈ ℝ (𝑦 < 𝑥 → ∃𝑤 ∈ 𝐴 𝑦 < 𝑤)))
46	3, 45	sylib 121	. . . . . . 7 ⊢ (𝜑 → ∃𝑥 ∈ ℝ (∀𝑦 ∈ 𝐴 ¬ 𝑥 < 𝑦 ∧ ∀𝑦 ∈ ℝ (𝑦 < 𝑥 → ∃𝑤 ∈ 𝐴 𝑦 < 𝑤)))
47	46	adantr 274	. . . . . 6 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → ∃𝑥 ∈ ℝ (∀𝑦 ∈ 𝐴 ¬ 𝑥 < 𝑦 ∧ ∀𝑦 ∈ ℝ (𝑦 < 𝑥 → ∃𝑤 ∈ 𝐴 𝑦 < 𝑤)))
48	13, 7	sstrdi 3154	. . . . . 6 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 𝐴 ⊆ ℝ)
49	47, 48, 21	suprleubex 8849	. . . . 5 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → (sup(𝐴, ℝ, < ) ≤ 𝑧 ↔ ∀𝑤 ∈ 𝐴 𝑤 ≤ 𝑧))
50	39, 49	mpbird 166	. . . 4 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → sup(𝐴, ℝ, < ) ≤ 𝑧)
51	47, 48, 18	suprubex 8846	. . . 4 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 𝑧 ≤ sup(𝐴, ℝ, < ))
52	16, 21	letri3d 8014	. . . 4 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → (sup(𝐴, ℝ, < ) = 𝑧 ↔ (sup(𝐴, ℝ, < ) ≤ 𝑧 ∧ 𝑧 ≤ sup(𝐴, ℝ, < ))))
53	50, 51, 52	mpbir2and 934	. . 3 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → sup(𝐴, ℝ, < ) = 𝑧)
54	53, 18	eqeltrd 2243	. 2 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → sup(𝐴, ℝ, < ) ∈ 𝐴)
55	12, 54	rexlimddv 2588	1 ⊢ (𝜑 → sup(𝐴, ℝ, < ) ∈ 𝐴)

Colors of variables: wff set class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 103 ↔ wb 104 = wceq 1343 ∈ wcel 2136 ∀wral 2444 ∃wrex 2445 ⊆ wss 3116 class class class wbr 3982 (class class class)co 5842 supcsup 6947 ℝcr 7752 1c1 7754 + caddc 7756 < clt 7933 ≤ cle 7934 − cmin 8069 ℤcz 9191

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-13 2138 ax-14 2139 ax-ext 2147 ax-sep 4100 ax-pow 4153 ax-pr 4187 ax-un 4411 ax-setind 4514 ax-cnex 7844 ax-resscn 7845 ax-1cn 7846 ax-1re 7847 ax-icn 7848 ax-addcl 7849 ax-addrcl 7850 ax-mulcl 7851 ax-addcom 7853 ax-addass 7855 ax-distr 7857 ax-i2m1 7858 ax-0lt1 7859 ax-0id 7861 ax-rnegex 7862 ax-cnre 7864 ax-pre-ltirr 7865 ax-pre-ltwlin 7866 ax-pre-lttrn 7867 ax-pre-apti 7868 ax-pre-ltadd 7869

This theorem depends on definitions: df-bi 116 df-3or 969 df-3an 970 df-tru 1346 df-fal 1349 df-nf 1449 df-sb 1751 df-eu 2017 df-mo 2018 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-ne 2337 df-nel 2432 df-ral 2449 df-rex 2450 df-reu 2451 df-rmo 2452 df-rab 2453 df-v 2728 df-sbc 2952 df-dif 3118 df-un 3120 df-in 3122 df-ss 3129 df-pw 3561 df-sn 3582 df-pr 3583 df-op 3585 df-uni 3790 df-int 3825 df-br 3983 df-opab 4044 df-id 4271 df-po 4274 df-iso 4275 df-xp 4610 df-rel 4611 df-cnv 4612 df-co 4613 df-dm 4614 df-iota 5153 df-fun 5190 df-fv 5196 df-riota 5798 df-ov 5845 df-oprab 5846 df-mpo 5847 df-sup 6949 df-pnf 7935 df-mnf 7936 df-xr 7937 df-ltxr 7938 df-le 7939 df-sub 8071 df-neg 8072 df-inn 8858 df-n0 9115 df-z 9192

This theorem is referenced by: infssuzcldc 11884 gcddvds 11896

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