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| Mirrors > Home > MPE Home > Th. List > xrge0f | Structured version Visualization version GIF version | ||
| Description: A real function is a nonnegative extended real function if all its values are greater than or equal to zero. (Contributed by Mario Carneiro, 28-Jun-2014.) (Revised by Mario Carneiro, 28-Jul-2014.) |
| Ref | Expression |
|---|---|
| xrge0f | ⊢ ((𝐹:ℝ⟶ℝ ∧ 0𝑝 ∘r ≤ 𝐹) → 𝐹:ℝ⟶(0[,]+∞)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ffn 6662 | . . 3 ⊢ (𝐹:ℝ⟶ℝ → 𝐹 Fn ℝ) | |
| 2 | 1 | adantr 481 | . 2 ⊢ ((𝐹:ℝ⟶ℝ ∧ 0𝑝 ∘r ≤ 𝐹) → 𝐹 Fn ℝ) |
| 3 | ax-resscn 11093 | . . . . . 6 ⊢ ℝ ⊆ ℂ | |
| 4 | 3 | a1i 11 | . . . . 5 ⊢ (𝐹:ℝ⟶ℝ → ℝ ⊆ ℂ) |
| 5 | 4, 1 | 0pledm 25665 | . . . 4 ⊢ (𝐹:ℝ⟶ℝ → (0𝑝 ∘r ≤ 𝐹 ↔ (ℝ × {0}) ∘r ≤ 𝐹)) |
| 6 | 0re 11144 | . . . . . 6 ⊢ 0 ∈ ℝ | |
| 7 | fnconstg 6722 | . . . . . 6 ⊢ (0 ∈ ℝ → (ℝ × {0}) Fn ℝ) | |
| 8 | 6, 7 | mp1i 13 | . . . . 5 ⊢ (𝐹:ℝ⟶ℝ → (ℝ × {0}) Fn ℝ) |
| 9 | reex 11127 | . . . . . 6 ⊢ ℝ ∈ V | |
| 10 | 9 | a1i 11 | . . . . 5 ⊢ (𝐹:ℝ⟶ℝ → ℝ ∈ V) |
| 11 | inidm 4162 | . . . . 5 ⊢ (ℝ ∩ ℝ) = ℝ | |
| 12 | c0ex 11136 | . . . . . . 7 ⊢ 0 ∈ V | |
| 13 | 12 | fvconst2 7155 | . . . . . 6 ⊢ (𝑥 ∈ ℝ → ((ℝ × {0})‘𝑥) = 0) |
| 14 | 13 | adantl 482 | . . . . 5 ⊢ ((𝐹:ℝ⟶ℝ ∧ 𝑥 ∈ ℝ) → ((ℝ × {0})‘𝑥) = 0) |
| 15 | eqidd 2741 | . . . . 5 ⊢ ((𝐹:ℝ⟶ℝ ∧ 𝑥 ∈ ℝ) → (𝐹‘𝑥) = (𝐹‘𝑥)) | |
| 16 | 8, 1, 10, 10, 11, 14, 15 | ofrfval 7637 | . . . 4 ⊢ (𝐹:ℝ⟶ℝ → ((ℝ × {0}) ∘r ≤ 𝐹 ↔ ∀𝑥 ∈ ℝ 0 ≤ (𝐹‘𝑥))) |
| 17 | ffvelcdm 7029 | . . . . . . . 8 ⊢ ((𝐹:ℝ⟶ℝ ∧ 𝑥 ∈ ℝ) → (𝐹‘𝑥) ∈ ℝ) | |
| 18 | 17 | rexrd 11193 | . . . . . . 7 ⊢ ((𝐹:ℝ⟶ℝ ∧ 𝑥 ∈ ℝ) → (𝐹‘𝑥) ∈ ℝ*) |
| 19 | 18 | biantrurd 537 | . . . . . 6 ⊢ ((𝐹:ℝ⟶ℝ ∧ 𝑥 ∈ ℝ) → (0 ≤ (𝐹‘𝑥) ↔ ((𝐹‘𝑥) ∈ ℝ* ∧ 0 ≤ (𝐹‘𝑥)))) |
| 20 | elxrge0 13408 | . . . . . 6 ⊢ ((𝐹‘𝑥) ∈ (0[,]+∞) ↔ ((𝐹‘𝑥) ∈ ℝ* ∧ 0 ≤ (𝐹‘𝑥))) | |
| 21 | 19, 20 | bitr4di 290 | . . . . 5 ⊢ ((𝐹:ℝ⟶ℝ ∧ 𝑥 ∈ ℝ) → (0 ≤ (𝐹‘𝑥) ↔ (𝐹‘𝑥) ∈ (0[,]+∞))) |
| 22 | 21 | ralbidva 3161 | . . . 4 ⊢ (𝐹:ℝ⟶ℝ → (∀𝑥 ∈ ℝ 0 ≤ (𝐹‘𝑥) ↔ ∀𝑥 ∈ ℝ (𝐹‘𝑥) ∈ (0[,]+∞))) |
| 23 | 5, 16, 22 | 3bitrd 306 | . . 3 ⊢ (𝐹:ℝ⟶ℝ → (0𝑝 ∘r ≤ 𝐹 ↔ ∀𝑥 ∈ ℝ (𝐹‘𝑥) ∈ (0[,]+∞))) |
| 24 | 23 | biimpa 477 | . 2 ⊢ ((𝐹:ℝ⟶ℝ ∧ 0𝑝 ∘r ≤ 𝐹) → ∀𝑥 ∈ ℝ (𝐹‘𝑥) ∈ (0[,]+∞)) |
| 25 | ffnfv 7067 | . 2 ⊢ (𝐹:ℝ⟶(0[,]+∞) ↔ (𝐹 Fn ℝ ∧ ∀𝑥 ∈ ℝ (𝐹‘𝑥) ∈ (0[,]+∞))) | |
| 26 | 2, 24, 25 | sylanbrc 589 | 1 ⊢ ((𝐹:ℝ⟶ℝ ∧ 0𝑝 ∘r ≤ 𝐹) → 𝐹:ℝ⟶(0[,]+∞)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 396 = wceq 1547 ∈ wcel 2119 ∀wral 3054 Vcvv 3432 ⊆ wss 3890 {csn 4562 class class class wbr 5079 × cxp 5623 Fn wfn 6487 ⟶wf 6488 ‘cfv 6492 (class class class)co 7363 ∘r cofr 7626 ℂcc 11034 ℝcr 11035 0cc0 11036 +∞cpnf 11174 ℝ*cxr 11176 ≤ cle 11178 [,]cicc 13299 0𝑝c0p 25661 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2712 ax-rep 5206 ax-sep 5225 ax-nul 5235 ax-pow 5301 ax-pr 5369 ax-un 7685 ax-cnex 11092 ax-resscn 11093 ax-1cn 11094 ax-icn 11095 ax-addcl 11096 ax-addrcl 11097 ax-mulcl 11098 ax-i2m1 11104 ax-rnegex 11107 ax-cnre 11109 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2719 df-cleq 2732 df-clel 2815 df-nfc 2889 df-ne 2936 df-nel 3040 df-ral 3055 df-rex 3065 df-reu 3346 df-rab 3393 df-v 3434 df-sbc 3731 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4269 df-if 4462 df-pw 4538 df-sn 4563 df-pr 4565 df-op 4569 df-uni 4846 df-iun 4930 df-br 5080 df-opab 5142 df-mpt 5161 df-id 5520 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-ov 7366 df-oprab 7367 df-mpo 7368 df-ofr 7628 df-pnf 11179 df-mnf 11180 df-xr 11181 df-ltxr 11182 df-le 11183 df-icc 13303 df-0p 25662 |
| This theorem is referenced by: itg2itg1 25728 |
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