suprzclex - Intuitionistic Logic Explorer

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Theorem suprzclex 9723

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 8395	. . . . . 6 ⊢ ((𝑓 ∈ ℝ ∧ 𝑔 ∈ ℝ) → (𝑓 = 𝑔 ↔ (¬ 𝑓 < 𝑔 ∧ ¬ 𝑔 < 𝑓)))
2	1	adantl 277	. . . . 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 7328	. . . 4 ⊢ (𝜑 → sup(𝐴, ℝ, < ) ∈ ℝ)
5	4	ltm1d 9252	. . 3 ⊢ (𝜑 → (sup(𝐴, ℝ, < ) − 1) < sup(𝐴, ℝ, < ))
6		suprzclex.ss	. . . . 5 ⊢ (𝜑 → 𝐴 ⊆ ℤ)
7		zssre 9630	. . . . 5 ⊢ ℤ ⊆ ℝ
8	6, 7	sstrdi 3260	. . . 4 ⊢ (𝜑 → 𝐴 ⊆ ℝ)
9		peano2rem 8583	. . . . 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 9272	. . 3 ⊢ (𝜑 → ((sup(𝐴, ℝ, < ) − 1) < sup(𝐴, ℝ, < ) ↔ ∃𝑧 ∈ 𝐴 (sup(𝐴, ℝ, < ) − 1) < 𝑧))
12	5, 11	mpbid 147	. 2 ⊢ (𝜑 → ∃𝑧 ∈ 𝐴 (sup(𝐴, ℝ, < ) − 1) < 𝑧)
13	6	adantr 276	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 𝐴 ⊆ ℤ)
14	13	sselda 3248	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝑤 ∈ ℤ)
15	7, 14	sselid 3246	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝑤 ∈ ℝ)
16	4	adantr 276	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → sup(𝐴, ℝ, < ) ∈ ℝ)
17	16	adantr 276	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → sup(𝐴, ℝ, < ) ∈ ℝ)
18		simprl 535	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 𝑧 ∈ 𝐴)
19	13, 18	sseldd 3249	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 𝑧 ∈ ℤ)
20		zre 9627	. . . . . . . . . . 11 ⊢ (𝑧 ∈ ℤ → 𝑧 ∈ ℝ)
21	19, 20	syl 14	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 𝑧 ∈ ℝ)
22		peano2re 8452	. . . . . . . . . 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 276	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → (𝑧 + 1) ∈ ℝ)
25	3	ad2antrr 492	. . . . . . . . 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 492	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝐴 ⊆ ℝ)
27		simpr 110	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝑤 ∈ 𝐴)
28	25, 26, 27	suprubex 9271	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝑤 ≤ sup(𝐴, ℝ, < ))
29		simprr 537	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → (sup(𝐴, ℝ, < ) − 1) < 𝑧)
30		1red 8331	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 1 ∈ ℝ)
31	16, 30, 21	ltsubaddd 8859	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → ((sup(𝐴, ℝ, < ) − 1) < 𝑧 ↔ sup(𝐴, ℝ, < ) < (𝑧 + 1)))
32	29, 31	mpbid 147	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → sup(𝐴, ℝ, < ) < (𝑧 + 1))
33	32	adantr 276	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → sup(𝐴, ℝ, < ) < (𝑧 + 1))
34	15, 17, 24, 28, 33	lelttrd 8441	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝑤 < (𝑧 + 1))
35	19	adantr 276	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝑧 ∈ ℤ)
36		zleltp1 9679	. . . . . . . 8 ⊢ ((𝑤 ∈ ℤ ∧ 𝑧 ∈ ℤ) → (𝑤 ≤ 𝑧 ↔ 𝑤 < (𝑧 + 1)))
37	14, 35, 36	syl2anc 415	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → (𝑤 ≤ 𝑧 ↔ 𝑤 < (𝑧 + 1)))
38	34, 37	mpbird 167	. . . . . 6 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝑤 ≤ 𝑧)
39	38	ralrimiva 2623	. . . . 5 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → ∀𝑤 ∈ 𝐴 𝑤 ≤ 𝑧)
40		breq2 4129	. . . . . . . . . . . . 13 ⊢ (𝑧 = 𝑤 → (𝑦 < 𝑧 ↔ 𝑦 < 𝑤))
41	40	cbvrexv 2787	. . . . . . . . . . . 12 ⊢ (∃𝑧 ∈ 𝐴 𝑦 < 𝑧 ↔ ∃𝑤 ∈ 𝐴 𝑦 < 𝑤)
42	41	imbi2i 226	. . . . . . . . . . 11 ⊢ ((𝑦 < 𝑥 → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧) ↔ (𝑦 < 𝑥 → ∃𝑤 ∈ 𝐴 𝑦 < 𝑤))
43	42	ralbii 2556	. . . . . . . . . 10 ⊢ (∀𝑦 ∈ ℝ (𝑦 < 𝑥 → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧) ↔ ∀𝑦 ∈ ℝ (𝑦 < 𝑥 → ∃𝑤 ∈ 𝐴 𝑦 < 𝑤))
44	43	anbi2i 461	. . . . . . . . 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 2557	. . . . . . . 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 122	. . . . . . 7 ⊢ (𝜑 → ∃𝑥 ∈ ℝ (∀𝑦 ∈ 𝐴 ¬ 𝑥 < 𝑦 ∧ ∀𝑦 ∈ ℝ (𝑦 < 𝑥 → ∃𝑤 ∈ 𝐴 𝑦 < 𝑤)))
47	46	adantr 276	. . . . . 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 3260	. . . . . 6 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 𝐴 ⊆ ℝ)
49	47, 48, 21	suprleubex 9274	. . . . 5 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → (sup(𝐴, ℝ, < ) ≤ 𝑧 ↔ ∀𝑤 ∈ 𝐴 𝑤 ≤ 𝑧))
50	39, 49	mpbird 167	. . . 4 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → sup(𝐴, ℝ, < ) ≤ 𝑧)
51	47, 48, 18	suprubex 9271	. . . 4 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 𝑧 ≤ sup(𝐴, ℝ, < ))
52	16, 21	letri3d 8431	. . . 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 957	. . 3 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → sup(𝐴, ℝ, < ) = 𝑧)
54	53, 18	eqeltrd 2315	. 2 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → sup(𝐴, ℝ, < ) ∈ 𝐴)
55	12, 54	rexlimddv 2673	1 ⊢ (𝜑 → sup(𝐴, ℝ, < ) ∈ 𝐴)

Colors of variables: wff set class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1402 ∈ wcel 2209 ∀wral 2528 ∃wrex 2529 ⊆ wss 3220 class class class wbr 4125 (class class class)co 6075 supcsup 7312 ℝcr 8168 1c1 8170 + caddc 8172 < clt 8350 ≤ cle 8351 − cmin 8487 ℤcz 9623

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4244 ax-pow 4306 ax-pr 4341 ax-un 4573 ax-setind 4679 ax-cnex 8260 ax-resscn 8261 ax-1cn 8262 ax-1re 8263 ax-icn 8264 ax-addcl 8265 ax-addrcl 8266 ax-mulcl 8267 ax-addcom 8269 ax-addass 8271 ax-distr 8273 ax-i2m1 8274 ax-0lt1 8275 ax-0id 8277 ax-rnegex 8278 ax-cnre 8280 ax-pre-ltirr 8281 ax-pre-ltwlin 8282 ax-pre-lttrn 8283 ax-pre-apti 8284 ax-pre-ltadd 8285

This theorem depends on definitions: df-bi 117 df-3or 1010 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rmo 2536 df-rab 2537 df-v 2823 df-sbc 3052 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3687 df-sn 3711 df-pr 3712 df-op 3714 df-uni 3931 df-int 3966 df-br 4126 df-opab 4188 df-id 4433 df-po 4436 df-iso 4437 df-xp 4775 df-rel 4776 df-cnv 4777 df-co 4778 df-dm 4779 df-iota 5332 df-fun 5374 df-fv 5380 df-riota 6028 df-ov 6078 df-oprab 6079 df-mpo 6080 df-sup 7314 df-pnf 8352 df-mnf 8353 df-xr 8354 df-ltxr 8355 df-le 8356 df-sub 8489 df-neg 8490 df-inn 9284 df-n0 9543 df-z 9624

This theorem is referenced by: infssuzcldc 10646 gcddvds 12718

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