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| Mirrors > Home > ILE Home > Th. List > hoverlt1 | GIF version | ||
| Description: The hover function evaluated at a point less than one. (Contributed by Jim Kingdon, 22-Jul-2025.) |
| Ref | Expression |
|---|---|
| hover.f | ⊢ 𝐹 = (𝑥 ∈ ℝ ↦ sup({inf({𝑥, 0}, ℝ, < ), (𝑥 − 1)}, ℝ, < )) |
| Ref | Expression |
|---|---|
| hoverlt1 | ⊢ ((𝐶 ∈ ℝ ∧ 𝐶 < 1) → (𝐹‘𝐶) ≤ 0) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | hover.f | . . 3 ⊢ 𝐹 = (𝑥 ∈ ℝ ↦ sup({inf({𝑥, 0}, ℝ, < ), (𝑥 − 1)}, ℝ, < )) | |
| 2 | preq1 3746 | . . . . . 6 ⊢ (𝑥 = 𝐶 → {𝑥, 0} = {𝐶, 0}) | |
| 3 | 2 | infeq1d 7202 | . . . . 5 ⊢ (𝑥 = 𝐶 → inf({𝑥, 0}, ℝ, < ) = inf({𝐶, 0}, ℝ, < )) |
| 4 | oveq1 6020 | . . . . 5 ⊢ (𝑥 = 𝐶 → (𝑥 − 1) = (𝐶 − 1)) | |
| 5 | 3, 4 | preq12d 3754 | . . . 4 ⊢ (𝑥 = 𝐶 → {inf({𝑥, 0}, ℝ, < ), (𝑥 − 1)} = {inf({𝐶, 0}, ℝ, < ), (𝐶 − 1)}) |
| 6 | 5 | supeq1d 7177 | . . 3 ⊢ (𝑥 = 𝐶 → sup({inf({𝑥, 0}, ℝ, < ), (𝑥 − 1)}, ℝ, < ) = sup({inf({𝐶, 0}, ℝ, < ), (𝐶 − 1)}, ℝ, < )) |
| 7 | simpl 109 | . . 3 ⊢ ((𝐶 ∈ ℝ ∧ 𝐶 < 1) → 𝐶 ∈ ℝ) | |
| 8 | 0red 8170 | . . . . 5 ⊢ ((𝐶 ∈ ℝ ∧ 𝐶 < 1) → 0 ∈ ℝ) | |
| 9 | mincl 11782 | . . . . 5 ⊢ ((𝐶 ∈ ℝ ∧ 0 ∈ ℝ) → inf({𝐶, 0}, ℝ, < ) ∈ ℝ) | |
| 10 | 7, 8, 9 | syl2anc 411 | . . . 4 ⊢ ((𝐶 ∈ ℝ ∧ 𝐶 < 1) → inf({𝐶, 0}, ℝ, < ) ∈ ℝ) |
| 11 | peano2rem 8436 | . . . . 5 ⊢ (𝐶 ∈ ℝ → (𝐶 − 1) ∈ ℝ) | |
| 12 | 7, 11 | syl 14 | . . . 4 ⊢ ((𝐶 ∈ ℝ ∧ 𝐶 < 1) → (𝐶 − 1) ∈ ℝ) |
| 13 | maxcl 11761 | . . . 4 ⊢ ((inf({𝐶, 0}, ℝ, < ) ∈ ℝ ∧ (𝐶 − 1) ∈ ℝ) → sup({inf({𝐶, 0}, ℝ, < ), (𝐶 − 1)}, ℝ, < ) ∈ ℝ) | |
| 14 | 10, 12, 13 | syl2anc 411 | . . 3 ⊢ ((𝐶 ∈ ℝ ∧ 𝐶 < 1) → sup({inf({𝐶, 0}, ℝ, < ), (𝐶 − 1)}, ℝ, < ) ∈ ℝ) |
| 15 | 1, 6, 7, 14 | fvmptd3 5736 | . 2 ⊢ ((𝐶 ∈ ℝ ∧ 𝐶 < 1) → (𝐹‘𝐶) = sup({inf({𝐶, 0}, ℝ, < ), (𝐶 − 1)}, ℝ, < )) |
| 16 | min2inf 11784 | . . . 4 ⊢ ((𝐶 ∈ ℝ ∧ 0 ∈ ℝ) → inf({𝐶, 0}, ℝ, < ) ≤ 0) | |
| 17 | 7, 8, 16 | syl2anc 411 | . . 3 ⊢ ((𝐶 ∈ ℝ ∧ 𝐶 < 1) → inf({𝐶, 0}, ℝ, < ) ≤ 0) |
| 18 | 1red 8184 | . . . . 5 ⊢ ((𝐶 ∈ ℝ ∧ 𝐶 < 1) → 1 ∈ ℝ) | |
| 19 | simpr 110 | . . . . 5 ⊢ ((𝐶 ∈ ℝ ∧ 𝐶 < 1) → 𝐶 < 1) | |
| 20 | 7, 18, 19 | ltled 8288 | . . . 4 ⊢ ((𝐶 ∈ ℝ ∧ 𝐶 < 1) → 𝐶 ≤ 1) |
| 21 | 7, 18 | suble0d 8706 | . . . 4 ⊢ ((𝐶 ∈ ℝ ∧ 𝐶 < 1) → ((𝐶 − 1) ≤ 0 ↔ 𝐶 ≤ 1)) |
| 22 | 20, 21 | mpbird 167 | . . 3 ⊢ ((𝐶 ∈ ℝ ∧ 𝐶 < 1) → (𝐶 − 1) ≤ 0) |
| 23 | maxleastb 11765 | . . . 4 ⊢ ((inf({𝐶, 0}, ℝ, < ) ∈ ℝ ∧ (𝐶 − 1) ∈ ℝ ∧ 0 ∈ ℝ) → (sup({inf({𝐶, 0}, ℝ, < ), (𝐶 − 1)}, ℝ, < ) ≤ 0 ↔ (inf({𝐶, 0}, ℝ, < ) ≤ 0 ∧ (𝐶 − 1) ≤ 0))) | |
| 24 | 10, 12, 8, 23 | syl3anc 1271 | . . 3 ⊢ ((𝐶 ∈ ℝ ∧ 𝐶 < 1) → (sup({inf({𝐶, 0}, ℝ, < ), (𝐶 − 1)}, ℝ, < ) ≤ 0 ↔ (inf({𝐶, 0}, ℝ, < ) ≤ 0 ∧ (𝐶 − 1) ≤ 0))) |
| 25 | 17, 22, 24 | mpbir2and 950 | . 2 ⊢ ((𝐶 ∈ ℝ ∧ 𝐶 < 1) → sup({inf({𝐶, 0}, ℝ, < ), (𝐶 − 1)}, ℝ, < ) ≤ 0) |
| 26 | 15, 25 | eqbrtrd 4108 | 1 ⊢ ((𝐶 ∈ ℝ ∧ 𝐶 < 1) → (𝐹‘𝐶) ≤ 0) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1395 ∈ wcel 2200 {cpr 3668 class class class wbr 4086 ↦ cmpt 4148 ‘cfv 5324 (class class class)co 6013 supcsup 7172 infcinf 7173 ℝcr 8021 0cc0 8022 1c1 8023 < clt 8204 ≤ cle 8205 − cmin 8340 |
| 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-coll 4202 ax-sep 4205 ax-nul 4213 ax-pow 4262 ax-pr 4297 ax-un 4528 ax-setind 4633 ax-iinf 4684 ax-cnex 8113 ax-resscn 8114 ax-1cn 8115 ax-1re 8116 ax-icn 8117 ax-addcl 8118 ax-addrcl 8119 ax-mulcl 8120 ax-mulrcl 8121 ax-addcom 8122 ax-mulcom 8123 ax-addass 8124 ax-mulass 8125 ax-distr 8126 ax-i2m1 8127 ax-0lt1 8128 ax-1rid 8129 ax-0id 8130 ax-rnegex 8131 ax-precex 8132 ax-cnre 8133 ax-pre-ltirr 8134 ax-pre-ltwlin 8135 ax-pre-lttrn 8136 ax-pre-apti 8137 ax-pre-ltadd 8138 ax-pre-mulgt0 8139 ax-pre-mulext 8140 ax-arch 8141 ax-caucvg 8142 |
| This theorem depends on definitions: df-bi 117 df-dc 840 df-3or 1003 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-reu 2515 df-rmo 2516 df-rab 2517 df-v 2802 df-sbc 3030 df-csb 3126 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-nul 3493 df-if 3604 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-int 3927 df-iun 3970 df-br 4087 df-opab 4149 df-mpt 4150 df-tr 4186 df-id 4388 df-po 4391 df-iso 4392 df-iord 4461 df-on 4463 df-ilim 4464 df-suc 4466 df-iom 4687 df-xp 4729 df-rel 4730 df-cnv 4731 df-co 4732 df-dm 4733 df-rn 4734 df-res 4735 df-ima 4736 df-iota 5284 df-fun 5326 df-fn 5327 df-f 5328 df-f1 5329 df-fo 5330 df-f1o 5331 df-fv 5332 df-isom 5333 df-riota 5966 df-ov 6016 df-oprab 6017 df-mpo 6018 df-1st 6298 df-2nd 6299 df-recs 6466 df-frec 6552 df-sup 7174 df-inf 7175 df-pnf 8206 df-mnf 8207 df-xr 8208 df-ltxr 8209 df-le 8210 df-sub 8342 df-neg 8343 df-reap 8745 df-ap 8752 df-div 8843 df-inn 9134 df-2 9192 df-3 9193 df-4 9194 df-n0 9393 df-z 9470 df-uz 9746 df-rp 9879 df-seqfrec 10700 df-exp 10791 df-cj 11393 df-re 11394 df-im 11395 df-rsqrt 11549 df-abs 11550 |
| This theorem is referenced by: ivthdichlem 15365 |
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