| Mathbox for Stanislas Polu |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > MPE Home > Th. List > Mathboxes > extoimad | Structured version Visualization version GIF version | ||
| Description: If |f(x)| <= C for all x then it applies to all x in the image of |f(x)| (Contributed by Stanislas Polu, 9-Mar-2020.) |
| Ref | Expression |
|---|---|
| extoimad.1 | ⊢ (𝜑 → 𝐹:ℝ⟶ℝ) |
| extoimad.2 | ⊢ (𝜑 → ∀𝑦 ∈ ℝ (abs‘(𝐹‘𝑦)) ≤ 𝐶) |
| Ref | Expression |
|---|---|
| extoimad | ⊢ (𝜑 → ∀𝑥 ∈ (abs “ (𝐹 “ ℝ))𝑥 ≤ 𝐶) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | extoimad.2 | . 2 ⊢ (𝜑 → ∀𝑦 ∈ ℝ (abs‘(𝐹‘𝑦)) ≤ 𝐶) | |
| 2 | extoimad.1 | . . . . . 6 ⊢ (𝜑 → 𝐹:ℝ⟶ℝ) | |
| 3 | 2 | ffvelcdmda 7079 | . . . . 5 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (𝐹‘𝑦) ∈ ℝ) |
| 4 | 3 | recnd 11243 | . . . 4 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (𝐹‘𝑦) ∈ ℂ) |
| 5 | 4 | abscld 15497 | . . 3 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (abs‘(𝐹‘𝑦)) ∈ ℝ) |
| 6 | imaco 6251 | . . . . . 6 ⊢ ((abs ∘ 𝐹) “ ℝ) = (abs “ (𝐹 “ ℝ)) | |
| 7 | 6 | a1i 11 | . . . . 5 ⊢ (𝜑 → ((abs ∘ 𝐹) “ ℝ) = (abs “ (𝐹 “ ℝ))) |
| 8 | 7 | eleq2d 2848 | . . . 4 ⊢ (𝜑 → (𝑥 ∈ ((abs ∘ 𝐹) “ ℝ) ↔ 𝑥 ∈ (abs “ (𝐹 “ ℝ)))) |
| 9 | absf 15396 | . . . . . . . . . . 11 ⊢ abs:ℂ⟶ℝ | |
| 10 | 9 | a1i 11 | . . . . . . . . . 10 ⊢ (𝜑 → abs:ℂ⟶ℝ) |
| 11 | ax-resscn 11163 | . . . . . . . . . . 11 ⊢ ℝ ⊆ ℂ | |
| 12 | 11 | a1i 11 | . . . . . . . . . 10 ⊢ (𝜑 → ℝ ⊆ ℂ) |
| 13 | 10, 12 | fssresd 6745 | . . . . . . . . 9 ⊢ (𝜑 → (abs ↾ ℝ):ℝ⟶ℝ) |
| 14 | 2, 13 | fco2d 44916 | . . . . . . . 8 ⊢ (𝜑 → (abs ∘ 𝐹):ℝ⟶ℝ) |
| 15 | 14 | ffnd 6706 | . . . . . . 7 ⊢ (𝜑 → (abs ∘ 𝐹) Fn ℝ) |
| 16 | ssidd 3959 | . . . . . . 7 ⊢ (𝜑 → ℝ ⊆ ℝ) | |
| 17 | 15, 16 | fvelimabd 6954 | . . . . . 6 ⊢ (𝜑 → (𝑥 ∈ ((abs ∘ 𝐹) “ ℝ) ↔ ∃𝑦 ∈ ℝ ((abs ∘ 𝐹)‘𝑦) = 𝑥)) |
| 18 | eqcom 2769 | . . . . . . . 8 ⊢ (((abs ∘ 𝐹)‘𝑦) = 𝑥 ↔ 𝑥 = ((abs ∘ 𝐹)‘𝑦)) | |
| 19 | 18 | a1i 11 | . . . . . . 7 ⊢ (𝜑 → (((abs ∘ 𝐹)‘𝑦) = 𝑥 ↔ 𝑥 = ((abs ∘ 𝐹)‘𝑦))) |
| 20 | 19 | rexbidv 3188 | . . . . . 6 ⊢ (𝜑 → (∃𝑦 ∈ ℝ ((abs ∘ 𝐹)‘𝑦) = 𝑥 ↔ ∃𝑦 ∈ ℝ 𝑥 = ((abs ∘ 𝐹)‘𝑦))) |
| 21 | 17, 20 | bitrd 282 | . . . . 5 ⊢ (𝜑 → (𝑥 ∈ ((abs ∘ 𝐹) “ ℝ) ↔ ∃𝑦 ∈ ℝ 𝑥 = ((abs ∘ 𝐹)‘𝑦))) |
| 22 | 2 | adantr 485 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → 𝐹:ℝ⟶ℝ) |
| 23 | simpr 489 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → 𝑦 ∈ ℝ) | |
| 24 | 22, 23 | fvco3d 6982 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → ((abs ∘ 𝐹)‘𝑦) = (abs‘(𝐹‘𝑦))) |
| 25 | 24 | eqcomd 2768 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (abs‘(𝐹‘𝑦)) = ((abs ∘ 𝐹)‘𝑦)) |
| 26 | 25 | eqeq2d 2773 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (𝑥 = (abs‘(𝐹‘𝑦)) ↔ 𝑥 = ((abs ∘ 𝐹)‘𝑦))) |
| 27 | 26 | rexbidva 3186 | . . . . 5 ⊢ (𝜑 → (∃𝑦 ∈ ℝ 𝑥 = (abs‘(𝐹‘𝑦)) ↔ ∃𝑦 ∈ ℝ 𝑥 = ((abs ∘ 𝐹)‘𝑦))) |
| 28 | 21, 27 | bitr4d 285 | . . . 4 ⊢ (𝜑 → (𝑥 ∈ ((abs ∘ 𝐹) “ ℝ) ↔ ∃𝑦 ∈ ℝ 𝑥 = (abs‘(𝐹‘𝑦)))) |
| 29 | 8, 28 | bitr3d 284 | . . 3 ⊢ (𝜑 → (𝑥 ∈ (abs “ (𝐹 “ ℝ)) ↔ ∃𝑦 ∈ ℝ 𝑥 = (abs‘(𝐹‘𝑦)))) |
| 30 | simpr 489 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 = (abs‘(𝐹‘𝑦))) → 𝑥 = (abs‘(𝐹‘𝑦))) | |
| 31 | 30 | breq1d 5118 | . . 3 ⊢ ((𝜑 ∧ 𝑥 = (abs‘(𝐹‘𝑦))) → (𝑥 ≤ 𝐶 ↔ (abs‘(𝐹‘𝑦)) ≤ 𝐶)) |
| 32 | 5, 29, 31 | ralxfr2d 5380 | . 2 ⊢ (𝜑 → (∀𝑥 ∈ (abs “ (𝐹 “ ℝ))𝑥 ≤ 𝐶 ↔ ∀𝑦 ∈ ℝ (abs‘(𝐹‘𝑦)) ≤ 𝐶)) |
| 33 | 1, 32 | mpbird 260 | 1 ⊢ (𝜑 → ∀𝑥 ∈ (abs “ (𝐹 “ ℝ))𝑥 ≤ 𝐶) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 400 = wceq 1569 ∈ wcel 2142 ∀wral 3078 ∃wrex 3088 ⊆ wss 3904 class class class wbr 5108 “ cima 5663 ∘ ccom 5664 ⟶wf 6532 ‘cfv 6536 ℂcc 11104 ℝcr 11105 ≤ cle 11250 abscabs 15292 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1824 ax-4 1838 ax-5 1939 ax-6 1996 ax-7 2037 ax-8 2144 ax-9 2152 ax-10 2175 ax-11 2191 ax-12 2212 ax-ext 2734 ax-sep 5256 ax-nul 5268 ax-pow 5335 ax-pr 5403 ax-un 7734 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183 ax-pre-sup 11184 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1103 df-3an 1104 df-tru 1572 df-fal 1582 df-ex 1809 df-nf 1813 df-sb 2096 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-rmo 3368 df-reu 3369 df-rab 3416 df-v 3456 df-sbc 3744 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4487 df-pw 4563 df-sn 4589 df-pr 4591 df-op 4595 df-uni 4872 df-iun 4957 df-br 5109 df-opab 5173 df-mpt 5192 df-tr 5218 df-id 5555 df-eprel 5560 df-po 5568 df-so 5569 df-fr 5613 df-we 5615 df-xp 5666 df-rel 5667 df-cnv 5668 df-co 5669 df-dm 5670 df-rn 5671 df-res 5672 df-ima 5673 df-pred 6302 df-ord 6363 df-on 6364 df-lim 6365 df-suc 6366 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7861 df-2nd 7985 df-frecs 8276 df-wrecs 8307 df-recs 8356 df-rdg 8395 df-er 8692 df-en 8942 df-dom 8943 df-sdom 8944 df-sup 9400 df-pnf 11251 df-mnf 11252 df-xr 11253 df-ltxr 11254 df-le 11255 df-sub 11449 df-neg 11450 df-div 11878 df-nn 12240 df-2 12309 df-3 12310 df-n0 12511 df-z 12598 df-uz 12869 df-rp 13023 df-seq 14045 df-exp 14105 df-cj 15157 df-re 15158 df-im 15159 df-sqrt 15293 df-abs 15294 |
| This theorem is used by: imo72b2lem0 44919 imo72b2lem2 44921 imo72b2lem1 44923 imo72b2 44926 |
| Copyright terms: Public domain | W3C validator |