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| Mirrors > Home > MPE Home > Th. List > 0plef | Structured version Visualization version GIF version | ||
| Description: Two ways to say that the function 𝐹 on the reals is nonnegative. (Contributed by Mario Carneiro, 17-Aug-2014.) |
| Ref | Expression |
|---|---|
| 0plef | ⊢ (𝐹:ℝ⟶(0[,)+∞) ↔ (𝐹:ℝ⟶ℝ ∧ 0𝑝 ∘r ≤ 𝐹)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | rge0ssre 13627 | . . 3 ⊢ (0[,)+∞) ⊆ ℝ | |
| 2 | fss 6756 | . . 3 ⊢ ((𝐹:ℝ⟶(0[,)+∞) ∧ (0[,)+∞) ⊆ ℝ) → 𝐹:ℝ⟶ℝ) | |
| 3 | 1, 2 | mpan2 704 | . 2 ⊢ (𝐹:ℝ⟶(0[,)+∞) → 𝐹:ℝ⟶ℝ) |
| 4 | ffvelcdm 7113 | . . . . 5 ⊢ ((𝐹:ℝ⟶ℝ ∧ 𝑥 ∈ ℝ) → (𝐹‘𝑥) ∈ ℝ) | |
| 5 | elrege0 13625 | . . . . . 6 ⊢ ((𝐹‘𝑥) ∈ (0[,)+∞) ↔ ((𝐹‘𝑥) ∈ ℝ ∧ 0 ≤ (𝐹‘𝑥))) | |
| 6 | 5 | baib 545 | . . . . 5 ⊢ ((𝐹‘𝑥) ∈ ℝ → ((𝐹‘𝑥) ∈ (0[,)+∞) ↔ 0 ≤ (𝐹‘𝑥))) |
| 7 | 4, 6 | syl 18 | . . . 4 ⊢ ((𝐹:ℝ⟶ℝ ∧ 𝑥 ∈ ℝ) → ((𝐹‘𝑥) ∈ (0[,)+∞) ↔ 0 ≤ (𝐹‘𝑥))) |
| 8 | 7 | ralbidva 3187 | . . 3 ⊢ (𝐹:ℝ⟶ℝ → (∀𝑥 ∈ ℝ (𝐹‘𝑥) ∈ (0[,)+∞) ↔ ∀𝑥 ∈ ℝ 0 ≤ (𝐹‘𝑥))) |
| 9 | ffn 6739 | . . . 4 ⊢ (𝐹:ℝ⟶ℝ → 𝐹 Fn ℝ) | |
| 10 | ffnfv 7151 | . . . . 5 ⊢ (𝐹:ℝ⟶(0[,)+∞) ↔ (𝐹 Fn ℝ ∧ ∀𝑥 ∈ ℝ (𝐹‘𝑥) ∈ (0[,)+∞))) | |
| 11 | 10 | baib 545 | . . . 4 ⊢ (𝐹 Fn ℝ → (𝐹:ℝ⟶(0[,)+∞) ↔ ∀𝑥 ∈ ℝ (𝐹‘𝑥) ∈ (0[,)+∞))) |
| 12 | 9, 11 | syl 18 | . . 3 ⊢ (𝐹:ℝ⟶ℝ → (𝐹:ℝ⟶(0[,)+∞) ↔ ∀𝑥 ∈ ℝ (𝐹‘𝑥) ∈ (0[,)+∞))) |
| 13 | 0cn 11337 | . . . . . . 7 ⊢ 0 ∈ ℂ | |
| 14 | fnconstg 6800 | . . . . . . 7 ⊢ (0 ∈ ℂ → (ℂ × {0}) Fn ℂ) | |
| 15 | 13, 14 | ax-mp 5 | . . . . . 6 ⊢ (ℂ × {0}) Fn ℂ |
| 16 | df-0p 26046 | . . . . . . 7 ⊢ 0𝑝 = (ℂ × {0}) | |
| 17 | 16 | fneq1i 6666 | . . . . . 6 ⊢ (0𝑝 Fn ℂ ↔ (ℂ × {0}) Fn ℂ) |
| 18 | 15, 17 | mpbir 234 | . . . . 5 ⊢ 0𝑝 Fn ℂ |
| 19 | 18 | a1i 11 | . . . 4 ⊢ (𝐹:ℝ⟶ℝ → 0𝑝 Fn ℂ) |
| 20 | cnex 11320 | . . . . 5 ⊢ ℂ ∈ V | |
| 21 | 20 | a1i 11 | . . . 4 ⊢ (𝐹:ℝ⟶ℝ → ℂ ∈ V) |
| 22 | reex 11330 | . . . . 5 ⊢ ℝ ∈ V | |
| 23 | 22 | a1i 11 | . . . 4 ⊢ (𝐹:ℝ⟶ℝ → ℝ ∈ V) |
| 24 | ax-resscn 11296 | . . . . 5 ⊢ ℝ ⊆ ℂ | |
| 25 | sseqin2 4123 | . . . . 5 ⊢ (ℝ ⊆ ℂ ↔ (ℂ ∩ ℝ) = ℝ) | |
| 26 | 24, 25 | mpbi 233 | . . . 4 ⊢ (ℂ ∩ ℝ) = ℝ |
| 27 | 0pval 26047 | . . . . 5 ⊢ (𝑥 ∈ ℂ → (0𝑝‘𝑥) = 0) | |
| 28 | 27 | adantl 487 | . . . 4 ⊢ ((𝐹:ℝ⟶ℝ ∧ 𝑥 ∈ ℂ) → (0𝑝‘𝑥) = 0) |
| 29 | eqidd 2764 | . . . 4 ⊢ ((𝐹:ℝ⟶ℝ ∧ 𝑥 ∈ ℝ) → (𝐹‘𝑥) = (𝐹‘𝑥)) | |
| 30 | 19, 9, 21, 23, 26, 28, 29 | ofrfval 7735 | . . 3 ⊢ (𝐹:ℝ⟶ℝ → (0𝑝 ∘r ≤ 𝐹 ↔ ∀𝑥 ∈ ℝ 0 ≤ (𝐹‘𝑥))) |
| 31 | 8, 12, 30 | 3bitr4d 314 | . 2 ⊢ (𝐹:ℝ⟶ℝ → (𝐹:ℝ⟶(0[,)+∞) ↔ 0𝑝 ∘r ≤ 𝐹)) |
| 32 | 3, 31 | biadanii 834 | 1 ⊢ (𝐹:ℝ⟶(0[,)+∞) ↔ (𝐹:ℝ⟶ℝ ∧ 0𝑝 ∘r ≤ 𝐹)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2147 ∀wral 3080 Vcvv 3454 ⊆ wss 3900 ∩ cin 4092 {csn 4588 class class class wbr 5108 × cxp 5656 Fn wfn 6561 ⟶wf 6562 ‘cfv 6566 (class class class)co 7451 ∘r cofr 7724 ℂcc 11237 ℝcr 11238 0cc0 11239 +∞cpnf 11379 ≤ cle 11383 [,)cico 13518 0𝑝c0p 26045 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-rep 5238 ax-sep 5255 ax-nul 5266 ax-pow 5334 ax-pr 5398 ax-un 7783 ax-cnex 11295 ax-resscn 11296 ax-1cn 11297 ax-icn 11298 ax-addcl 11299 ax-addrcl 11300 ax-mulcl 11301 ax-i2m1 11307 ax-rnegex 11310 ax-cnre 11312 ax-pre-lttri 11313 ax-pre-lttrn 11314 |
| 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 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-iun 4958 df-br 5109 df-opab 5174 df-mpt 5193 df-id 5553 df-po 5566 df-so 5567 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-iota 6520 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 df-ov 7454 df-oprab 7455 df-mpo 7456 df-ofr 7726 df-er 8755 df-en 9012 df-dom 9013 df-sdom 9014 df-pnf 11384 df-mnf 11385 df-xr 11386 df-ltxr 11387 df-le 11388 df-ico 13522 df-0p 26046 |
| This theorem is used by: itg2i1fseq 26131 itg2addlem 26134 ftc1anclem8 38886 |
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