| Mathbox for Stanislas Polu |
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| 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 7080 | . . . . 5 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (𝐹‘𝑦) ∈ ℝ) |
| 4 | 3 | recnd 11264 | . . . 4 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → (𝐹‘𝑦) ∈ ℂ) |
| 5 | 4 | abscld 15528 | . . 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 15427 | . . . . . . . . . . 11 ⊢ abs:ℂ⟶ℝ | |
| 10 | 9 | a1i 11 | . . . . . . . . . 10 ⊢ (𝜑 → abs:ℂ⟶ℝ) |
| 11 | ax-resscn 11184 | . . . . . . . . . . 11 ⊢ ℝ ⊆ ℂ | |
| 12 | 11 | a1i 11 | . . . . . . . . . 10 ⊢ (𝜑 → ℝ ⊆ ℂ) |
| 13 | 10, 12 | fssresd 6746 | . . . . . . . . 9 ⊢ (𝜑 → (abs ↾ ℝ):ℝ⟶ℝ) |
| 14 | 2, 13 | fco2d 45004 | . . . . . . . 8 ⊢ (𝜑 → (abs ∘ 𝐹):ℝ⟶ℝ) |
| 15 | 14 | ffnd 6707 | . . . . . . 7 ⊢ (𝜑 → (abs ∘ 𝐹) Fn ℝ) |
| 16 | ssidd 3957 | . . . . . . 7 ⊢ (𝜑 → ℝ ⊆ ℝ) | |
| 17 | 15, 16 | fvelimabd 6955 | . . . . . 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 486 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → 𝐹:ℝ⟶ℝ) |
| 23 | simpr 490 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑦 ∈ ℝ) → 𝑦 ∈ ℝ) | |
| 24 | 22, 23 | fvco3d 6983 | . . . . . . . 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 490 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 = (abs‘(𝐹‘𝑦))) → 𝑥 = (abs‘(𝐹‘𝑦))) | |
| 31 | 30 | breq1d 5117 | . . 3 ⊢ ((𝜑 ∧ 𝑥 = (abs‘(𝐹‘𝑦))) → (𝑥 ≤ 𝐶 ↔ (abs‘(𝐹‘𝑦)) ≤ 𝐶)) |
| 32 | 5, 29, 31 | ralxfr2d 5379 | . 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 401 = wceq 1570 ∈ wcel 2145 ∀wral 3078 ∃wrex 3088 ⊆ wss 3902 class class class wbr 5107 “ cima 5662 ∘ ccom 5663 ⟶wf 6533 ‘cfv 6537 ℂcc 11125 ℝcr 11126 ≤ cle 11271 abscabs 15323 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7739 ax-cnex 11183 ax-resscn 11184 ax-1cn 11185 ax-icn 11186 ax-addcl 11187 ax-addrcl 11188 ax-mulcl 11189 ax-mulrcl 11190 ax-mulcom 11191 ax-addass 11192 ax-mulass 11193 ax-distr 11194 ax-i2m1 11195 ax-1ne0 11196 ax-1rid 11197 ax-rnegex 11198 ax-rrecex 11199 ax-cnre 11200 ax-pre-lttri 11201 ax-pre-lttrn 11202 ax-pre-ltadd 11203 ax-pre-mulgt0 11204 ax-pre-sup 11205 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 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 3367 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7373 df-ov 7419 df-oprab 7420 df-mpo 7421 df-om 7866 df-2nd 7990 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-er 8699 df-en 8956 df-dom 8957 df-sdom 8958 df-sup 9415 df-pnf 11272 df-mnf 11273 df-xr 11274 df-ltxr 11275 df-le 11276 df-sub 11470 df-neg 11471 df-div 11899 df-nn 12261 df-2 12330 df-3 12331 df-n0 12532 df-z 12619 df-uz 12891 df-rp 13045 df-seq 14068 df-exp 14128 df-cj 15188 df-re 15189 df-im 15190 df-sqrt 15324 df-abs 15325 |
| This theorem is used by: imo72b2lem0 45007 imo72b2lem2 45009 imo72b2lem1 45011 imo72b2 45014 |
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