Theorem dedekindicclemub 15350

Description: Lemma for dedekindicc 15356. The lower cut has an upper bound. (Contributed by Jim Kingdon, 15-Feb-2024.)

Hypotheses

Ref	Expression
dedekindicc.a	⊢ (𝜑 → 𝐴 ∈ ℝ)
dedekindicc.b	⊢ (𝜑 → 𝐵 ∈ ℝ)
dedekindicc.lss	⊢ (𝜑 → 𝐿 ⊆ (𝐴[,]𝐵))
dedekindicc.uss	⊢ (𝜑 → 𝑈 ⊆ (𝐴[,]𝐵))
dedekindicc.lm	⊢ (𝜑 → ∃𝑞 ∈ (𝐴[,]𝐵)𝑞 ∈ 𝐿)
dedekindicc.um	⊢ (𝜑 → ∃𝑟 ∈ (𝐴[,]𝐵)𝑟 ∈ 𝑈)
dedekindicc.lr	⊢ (𝜑 → ∀𝑞 ∈ (𝐴[,]𝐵)(𝑞 ∈ 𝐿 ↔ ∃𝑟 ∈ 𝐿 𝑞 < 𝑟))
dedekindicc.ur	⊢ (𝜑 → ∀𝑟 ∈ (𝐴[,]𝐵)(𝑟 ∈ 𝑈 ↔ ∃𝑞 ∈ 𝑈 𝑞 < 𝑟))
dedekindicc.disj	⊢ (𝜑 → (𝐿 ∩ 𝑈) = ∅)
dedekindicc.loc	⊢ (𝜑 → ∀𝑞 ∈ (𝐴[,]𝐵)∀𝑟 ∈ (𝐴[,]𝐵)(𝑞 < 𝑟 → (𝑞 ∈ 𝐿 ∨ 𝑟 ∈ 𝑈)))

Assertion

Ref	Expression
dedekindicclemub	⊢ (𝜑 → ∃𝑥 ∈ (𝐴[,]𝐵)∀𝑦 ∈ 𝐿 𝑦 < 𝑥)

Distinct variable groups:   𝐴,𝑞,𝑟,𝑦   𝑥,𝐴,𝑦   𝐵,𝑞,𝑟,𝑦   𝑥,𝐵   𝐿,𝑞,𝑦   𝑥,𝐿   𝑈,𝑞,𝑟,𝑦   𝜑,𝑞,𝑦

Allowed substitution hints:   𝜑(𝑥,𝑟)   𝑈(𝑥)   𝐿(𝑟)

Proof of Theorem dedekindicclemub

Dummy variable 𝑎 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		dedekindicc.um	. . 3 ⊢ (𝜑 → ∃𝑟 ∈ (𝐴[,]𝐵)𝑟 ∈ 𝑈)
2		eleq1w 2292	. . . 4 ⊢ (𝑟 = 𝑎 → (𝑟 ∈ 𝑈 ↔ 𝑎 ∈ 𝑈))
3	2	cbvrexv 2768	. . 3 ⊢ (∃𝑟 ∈ (𝐴[,]𝐵)𝑟 ∈ 𝑈 ↔ ∃𝑎 ∈ (𝐴[,]𝐵)𝑎 ∈ 𝑈)
4	1, 3	sylib 122	. 2 ⊢ (𝜑 → ∃𝑎 ∈ (𝐴[,]𝐵)𝑎 ∈ 𝑈)
5		simprl 531	. . 3 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝐴[,]𝐵) ∧ 𝑎 ∈ 𝑈)) → 𝑎 ∈ (𝐴[,]𝐵))
6		dedekindicc.a	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ ℝ)
7	6	adantr 276	. . . 4 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝐴[,]𝐵) ∧ 𝑎 ∈ 𝑈)) → 𝐴 ∈ ℝ)
8		dedekindicc.b	. . . . 5 ⊢ (𝜑 → 𝐵 ∈ ℝ)
9	8	adantr 276	. . . 4 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝐴[,]𝐵) ∧ 𝑎 ∈ 𝑈)) → 𝐵 ∈ ℝ)
10		dedekindicc.lss	. . . . 5 ⊢ (𝜑 → 𝐿 ⊆ (𝐴[,]𝐵))
11	10	adantr 276	. . . 4 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝐴[,]𝐵) ∧ 𝑎 ∈ 𝑈)) → 𝐿 ⊆ (𝐴[,]𝐵))
12		dedekindicc.uss	. . . . 5 ⊢ (𝜑 → 𝑈 ⊆ (𝐴[,]𝐵))
13	12	adantr 276	. . . 4 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝐴[,]𝐵) ∧ 𝑎 ∈ 𝑈)) → 𝑈 ⊆ (𝐴[,]𝐵))
14		dedekindicc.lm	. . . . 5 ⊢ (𝜑 → ∃𝑞 ∈ (𝐴[,]𝐵)𝑞 ∈ 𝐿)
15	14	adantr 276	. . . 4 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝐴[,]𝐵) ∧ 𝑎 ∈ 𝑈)) → ∃𝑞 ∈ (𝐴[,]𝐵)𝑞 ∈ 𝐿)
16	1	adantr 276	. . . 4 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝐴[,]𝐵) ∧ 𝑎 ∈ 𝑈)) → ∃𝑟 ∈ (𝐴[,]𝐵)𝑟 ∈ 𝑈)
17		dedekindicc.lr	. . . . 5 ⊢ (𝜑 → ∀𝑞 ∈ (𝐴[,]𝐵)(𝑞 ∈ 𝐿 ↔ ∃𝑟 ∈ 𝐿 𝑞 < 𝑟))
18	17	adantr 276	. . . 4 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝐴[,]𝐵) ∧ 𝑎 ∈ 𝑈)) → ∀𝑞 ∈ (𝐴[,]𝐵)(𝑞 ∈ 𝐿 ↔ ∃𝑟 ∈ 𝐿 𝑞 < 𝑟))
19		dedekindicc.ur	. . . . 5 ⊢ (𝜑 → ∀𝑟 ∈ (𝐴[,]𝐵)(𝑟 ∈ 𝑈 ↔ ∃𝑞 ∈ 𝑈 𝑞 < 𝑟))
20	19	adantr 276	. . . 4 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝐴[,]𝐵) ∧ 𝑎 ∈ 𝑈)) → ∀𝑟 ∈ (𝐴[,]𝐵)(𝑟 ∈ 𝑈 ↔ ∃𝑞 ∈ 𝑈 𝑞 < 𝑟))
21		dedekindicc.disj	. . . . 5 ⊢ (𝜑 → (𝐿 ∩ 𝑈) = ∅)
22	21	adantr 276	. . . 4 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝐴[,]𝐵) ∧ 𝑎 ∈ 𝑈)) → (𝐿 ∩ 𝑈) = ∅)
23		dedekindicc.loc	. . . . 5 ⊢ (𝜑 → ∀𝑞 ∈ (𝐴[,]𝐵)∀𝑟 ∈ (𝐴[,]𝐵)(𝑞 < 𝑟 → (𝑞 ∈ 𝐿 ∨ 𝑟 ∈ 𝑈)))
24	23	adantr 276	. . . 4 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝐴[,]𝐵) ∧ 𝑎 ∈ 𝑈)) → ∀𝑞 ∈ (𝐴[,]𝐵)∀𝑟 ∈ (𝐴[,]𝐵)(𝑞 < 𝑟 → (𝑞 ∈ 𝐿 ∨ 𝑟 ∈ 𝑈)))
25		simprr 533	. . . 4 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝐴[,]𝐵) ∧ 𝑎 ∈ 𝑈)) → 𝑎 ∈ 𝑈)
26	7, 9, 11, 13, 15, 16, 18, 20, 22, 24, 25	dedekindicclemuub 15349	. . 3 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝐴[,]𝐵) ∧ 𝑎 ∈ 𝑈)) → ∀𝑦 ∈ 𝐿 𝑦 < 𝑎)
27		brralrspcev 4147	. . 3 ⊢ ((𝑎 ∈ (𝐴[,]𝐵) ∧ ∀𝑦 ∈ 𝐿 𝑦 < 𝑎) → ∃𝑥 ∈ (𝐴[,]𝐵)∀𝑦 ∈ 𝐿 𝑦 < 𝑥)
28	5, 26, 27	syl2anc 411	. 2 ⊢ ((𝜑 ∧ (𝑎 ∈ (𝐴[,]𝐵) ∧ 𝑎 ∈ 𝑈)) → ∃𝑥 ∈ (𝐴[,]𝐵)∀𝑦 ∈ 𝐿 𝑦 < 𝑥)
29	4, 28	rexlimddv 2655	1 ⊢ (𝜑 → ∃𝑥 ∈ (𝐴[,]𝐵)∀𝑦 ∈ 𝐿 𝑦 < 𝑥)

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105   ∨ wo 715   = wceq 1397   ∈ wcel 2202  ∀wral 2510  ∃wrex 2511   ∩ cin 3199   ⊆ wss 3200  ∅c0 3494   class class class wbr 4088  (class class class)co 6017  ℝcr 8030   < clt 8213  [,]cicc 10125

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 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-cnex 8122  ax-resscn 8123  ax-pre-ltirr 8143  ax-pre-ltwlin 8144  ax-pre-lttrn 8145

This theorem depends on definitions:  df-bi 117  df-3or 1005  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-rab 2519  df-v 2804  df-sbc 3032  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-id 4390  df-po 4393  df-iso 4394  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-iota 5286  df-fun 5328  df-fv 5334  df-ov 6020  df-oprab 6021  df-mpo 6022  df-pnf 8215  df-mnf 8216  df-xr 8217  df-ltxr 8218  df-le 8219  df-icc 10129

This theorem is referenced by: (None)