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| Mirrors > Home > ILE Home > Th. List > ivthinclemum | GIF version | ||
| Description: Lemma for ivthinc 15437. The upper cut is bounded. (Contributed by Jim Kingdon, 18-Feb-2024.) |
| Ref | Expression |
|---|---|
| ivth.1 | ⊢ (𝜑 → 𝐴 ∈ ℝ) |
| ivth.2 | ⊢ (𝜑 → 𝐵 ∈ ℝ) |
| ivth.3 | ⊢ (𝜑 → 𝑈 ∈ ℝ) |
| ivth.4 | ⊢ (𝜑 → 𝐴 < 𝐵) |
| ivth.5 | ⊢ (𝜑 → (𝐴[,]𝐵) ⊆ 𝐷) |
| ivth.7 | ⊢ (𝜑 → 𝐹 ∈ (𝐷–cn→ℂ)) |
| ivth.8 | ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐴[,]𝐵)) → (𝐹‘𝑥) ∈ ℝ) |
| ivth.9 | ⊢ (𝜑 → ((𝐹‘𝐴) < 𝑈 ∧ 𝑈 < (𝐹‘𝐵))) |
| ivthinc.i | ⊢ (((𝜑 ∧ 𝑥 ∈ (𝐴[,]𝐵)) ∧ (𝑦 ∈ (𝐴[,]𝐵) ∧ 𝑥 < 𝑦)) → (𝐹‘𝑥) < (𝐹‘𝑦)) |
| ivthinclem.l | ⊢ 𝐿 = {𝑤 ∈ (𝐴[,]𝐵) ∣ (𝐹‘𝑤) < 𝑈} |
| ivthinclem.r | ⊢ 𝑅 = {𝑤 ∈ (𝐴[,]𝐵) ∣ 𝑈 < (𝐹‘𝑤)} |
| Ref | Expression |
|---|---|
| ivthinclemum | ⊢ (𝜑 → ∃𝑟 ∈ (𝐴[,]𝐵)𝑟 ∈ 𝑅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ivth.1 | . . . 4 ⊢ (𝜑 → 𝐴 ∈ ℝ) | |
| 2 | 1 | rexrd 8271 | . . 3 ⊢ (𝜑 → 𝐴 ∈ ℝ*) |
| 3 | ivth.2 | . . . 4 ⊢ (𝜑 → 𝐵 ∈ ℝ) | |
| 4 | 3 | rexrd 8271 | . . 3 ⊢ (𝜑 → 𝐵 ∈ ℝ*) |
| 5 | ivth.4 | . . . 4 ⊢ (𝜑 → 𝐴 < 𝐵) | |
| 6 | 1, 3, 5 | ltled 8340 | . . 3 ⊢ (𝜑 → 𝐴 ≤ 𝐵) |
| 7 | ubicc2 10264 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ 𝐴 ≤ 𝐵) → 𝐵 ∈ (𝐴[,]𝐵)) | |
| 8 | 2, 4, 6, 7 | syl3anc 1274 | . 2 ⊢ (𝜑 → 𝐵 ∈ (𝐴[,]𝐵)) |
| 9 | ivth.9 | . . . 4 ⊢ (𝜑 → ((𝐹‘𝐴) < 𝑈 ∧ 𝑈 < (𝐹‘𝐵))) | |
| 10 | 9 | simprd 114 | . . 3 ⊢ (𝜑 → 𝑈 < (𝐹‘𝐵)) |
| 11 | fveq2 5648 | . . . . 5 ⊢ (𝑤 = 𝐵 → (𝐹‘𝑤) = (𝐹‘𝐵)) | |
| 12 | 11 | breq2d 4105 | . . . 4 ⊢ (𝑤 = 𝐵 → (𝑈 < (𝐹‘𝑤) ↔ 𝑈 < (𝐹‘𝐵))) |
| 13 | ivthinclem.r | . . . 4 ⊢ 𝑅 = {𝑤 ∈ (𝐴[,]𝐵) ∣ 𝑈 < (𝐹‘𝑤)} | |
| 14 | 12, 13 | elrab2 2966 | . . 3 ⊢ (𝐵 ∈ 𝑅 ↔ (𝐵 ∈ (𝐴[,]𝐵) ∧ 𝑈 < (𝐹‘𝐵))) |
| 15 | 8, 10, 14 | sylanbrc 417 | . 2 ⊢ (𝜑 → 𝐵 ∈ 𝑅) |
| 16 | eleq1 2294 | . . 3 ⊢ (𝑟 = 𝐵 → (𝑟 ∈ 𝑅 ↔ 𝐵 ∈ 𝑅)) | |
| 17 | 16 | rspcev 2911 | . 2 ⊢ ((𝐵 ∈ (𝐴[,]𝐵) ∧ 𝐵 ∈ 𝑅) → ∃𝑟 ∈ (𝐴[,]𝐵)𝑟 ∈ 𝑅) |
| 18 | 8, 15, 17 | syl2anc 411 | 1 ⊢ (𝜑 → ∃𝑟 ∈ (𝐴[,]𝐵)𝑟 ∈ 𝑅) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 = wceq 1398 ∈ wcel 2202 ∃wrex 2512 {crab 2515 ⊆ wss 3201 class class class wbr 4093 ‘cfv 5333 (class class class)co 6028 ℂcc 8073 ℝcr 8074 ℝ*cxr 8255 < clt 8256 ≤ cle 8257 [,]cicc 10170 –cn→ccncf 15364 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4212 ax-pow 4270 ax-pr 4305 ax-un 4536 ax-setind 4641 ax-cnex 8166 ax-resscn 8167 ax-pre-ltirr 8187 ax-pre-lttrn 8189 |
| This theorem depends on definitions: df-bi 117 df-3or 1006 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ne 2404 df-nel 2499 df-ral 2516 df-rex 2517 df-rab 2520 df-v 2805 df-sbc 3033 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-pw 3658 df-sn 3679 df-pr 3680 df-op 3682 df-uni 3899 df-br 4094 df-opab 4156 df-id 4396 df-xp 4737 df-rel 4738 df-cnv 4739 df-co 4740 df-dm 4741 df-iota 5293 df-fun 5335 df-fv 5341 df-ov 6031 df-oprab 6032 df-mpo 6033 df-pnf 8258 df-mnf 8259 df-xr 8260 df-ltxr 8261 df-le 8262 df-icc 10174 |
| This theorem is referenced by: ivthinclemex 15436 |
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