suprzclex - Intuitionistic Logic Explorer

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Theorem suprzclex 9382

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 8068	. . . . . 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 7028	. . . 4 ⊢ (𝜑 → sup(𝐴, ℝ, < ) ∈ ℝ)
5	4	ltm1d 8920	. . 3 ⊢ (𝜑 → (sup(𝐴, ℝ, < ) − 1) < sup(𝐴, ℝ, < ))
6		suprzclex.ss	. . . . 5 ⊢ (𝜑 → 𝐴 ⊆ ℤ)
7		zssre 9291	. . . . 5 ⊢ ℤ ⊆ ℝ
8	6, 7	sstrdi 3182	. . . 4 ⊢ (𝜑 → 𝐴 ⊆ ℝ)
9		peano2rem 8255	. . . . 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 8940	. . 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 3170	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝑤 ∈ ℤ)
15	7, 14	sselid 3168	. . . . . . . 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 529	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 𝑧 ∈ 𝐴)
19	13, 18	sseldd 3171	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 𝑧 ∈ ℤ)
20		zre 9288	. . . . . . . . . . 11 ⊢ (𝑧 ∈ ℤ → 𝑧 ∈ ℝ)
21	19, 20	syl 14	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 𝑧 ∈ ℝ)
22		peano2re 8124	. . . . . . . . . 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 488	. . . . . . . . 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 488	. . . . . . . . 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 8939	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) ∧ 𝑤 ∈ 𝐴) → 𝑤 ≤ sup(𝐴, ℝ, < ))
29		simprr 531	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → (sup(𝐴, ℝ, < ) − 1) < 𝑧)
30		1red 8003	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 1 ∈ ℝ)
31	16, 30, 21	ltsubaddd 8529	. . . . . . . . . 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 8113	. . . . . . 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 9339	. . . . . . . 8 ⊢ ((𝑤 ∈ ℤ ∧ 𝑧 ∈ ℤ) → (𝑤 ≤ 𝑧 ↔ 𝑤 < (𝑧 + 1)))
37	14, 35, 36	syl2anc 411	. . . . . . 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 2563	. . . . 5 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → ∀𝑤 ∈ 𝐴 𝑤 ≤ 𝑧)
40		breq2 4022	. . . . . . . . . . . . 13 ⊢ (𝑧 = 𝑤 → (𝑦 < 𝑧 ↔ 𝑦 < 𝑤))
41	40	cbvrexv 2719	. . . . . . . . . . . 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 2496	. . . . . . . . . 10 ⊢ (∀𝑦 ∈ ℝ (𝑦 < 𝑥 → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧) ↔ ∀𝑦 ∈ ℝ (𝑦 < 𝑥 → ∃𝑤 ∈ 𝐴 𝑦 < 𝑤))
44	43	anbi2i 457	. . . . . . . . 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 2497	. . . . . . . 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 3182	. . . . . 6 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 𝐴 ⊆ ℝ)
49	47, 48, 21	suprleubex 8942	. . . . 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 8939	. . . 4 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → 𝑧 ≤ sup(𝐴, ℝ, < ))
52	16, 21	letri3d 8104	. . . 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 946	. . 3 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → sup(𝐴, ℝ, < ) = 𝑧)
54	53, 18	eqeltrd 2266	. 2 ⊢ ((𝜑 ∧ (𝑧 ∈ 𝐴 ∧ (sup(𝐴, ℝ, < ) − 1) < 𝑧)) → sup(𝐴, ℝ, < ) ∈ 𝐴)
55	12, 54	rexlimddv 2612	1 ⊢ (𝜑 → sup(𝐴, ℝ, < ) ∈ 𝐴)

Colors of variables: wff set class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1364 ∈ wcel 2160 ∀wral 2468 ∃wrex 2469 ⊆ wss 3144 class class class wbr 4018 (class class class)co 5897 supcsup 7012 ℝcr 7841 1c1 7843 + caddc 7845 < clt 8023 ≤ cle 8024 − cmin 8159 ℤcz 9284

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 615 ax-in2 616 ax-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-13 2162 ax-14 2163 ax-ext 2171 ax-sep 4136 ax-pow 4192 ax-pr 4227 ax-un 4451 ax-setind 4554 ax-cnex 7933 ax-resscn 7934 ax-1cn 7935 ax-1re 7936 ax-icn 7937 ax-addcl 7938 ax-addrcl 7939 ax-mulcl 7940 ax-addcom 7942 ax-addass 7944 ax-distr 7946 ax-i2m1 7947 ax-0lt1 7948 ax-0id 7950 ax-rnegex 7951 ax-cnre 7953 ax-pre-ltirr 7954 ax-pre-ltwlin 7955 ax-pre-lttrn 7956 ax-pre-apti 7957 ax-pre-ltadd 7958

This theorem depends on definitions: df-bi 117 df-3or 981 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1472 df-sb 1774 df-eu 2041 df-mo 2042 df-clab 2176 df-cleq 2182 df-clel 2185 df-nfc 2321 df-ne 2361 df-nel 2456 df-ral 2473 df-rex 2474 df-reu 2475 df-rmo 2476 df-rab 2477 df-v 2754 df-sbc 2978 df-dif 3146 df-un 3148 df-in 3150 df-ss 3157 df-pw 3592 df-sn 3613 df-pr 3614 df-op 3616 df-uni 3825 df-int 3860 df-br 4019 df-opab 4080 df-id 4311 df-po 4314 df-iso 4315 df-xp 4650 df-rel 4651 df-cnv 4652 df-co 4653 df-dm 4654 df-iota 5196 df-fun 5237 df-fv 5243 df-riota 5852 df-ov 5900 df-oprab 5901 df-mpo 5902 df-sup 7014 df-pnf 8025 df-mnf 8026 df-xr 8027 df-ltxr 8028 df-le 8029 df-sub 8161 df-neg 8162 df-inn 8951 df-n0 9208 df-z 9285

This theorem is referenced by: infssuzcldc 11987 gcddvds 11999

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