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| Mirrors > Home > MPE Home > Th. List > abvge0 | Structured version Visualization version GIF version | ||
| Description: The absolute value of a number is greater than or equal to zero. (Contributed by Mario Carneiro, 8-Sep-2014.) |
| Ref | Expression |
|---|---|
| abvf.a | ⊢ 𝐴 = (AbsVal‘𝑅) |
| abvf.b | ⊢ 𝐵 = (Base‘𝑅) |
| Ref | Expression |
|---|---|
| abvge0 | ⊢ ((𝐹 ∈ 𝐴 ∧ 𝑋 ∈ 𝐵) → 0 ≤ (𝐹‘𝑋)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | abvf.a | . . . 4 ⊢ 𝐴 = (AbsVal‘𝑅) | |
| 2 | abvf.b | . . . 4 ⊢ 𝐵 = (Base‘𝑅) | |
| 3 | 1, 2 | abvfge0 21080 | . . 3 ⊢ (𝐹 ∈ 𝐴 → 𝐹:𝐵⟶(0[,)+∞)) |
| 4 | 3 | ffvelcdmda 7089 | . 2 ⊢ ((𝐹 ∈ 𝐴 ∧ 𝑋 ∈ 𝐵) → (𝐹‘𝑋) ∈ (0[,)+∞)) |
| 5 | elrege0 13592 | . . 3 ⊢ ((𝐹‘𝑋) ∈ (0[,)+∞) ↔ ((𝐹‘𝑋) ∈ ℝ ∧ 0 ≤ (𝐹‘𝑋))) | |
| 6 | 5 | simprbi 503 | . 2 ⊢ ((𝐹‘𝑋) ∈ (0[,)+∞) → 0 ≤ (𝐹‘𝑋)) |
| 7 | 4, 6 | syl 18 | 1 ⊢ ((𝐹 ∈ 𝐴 ∧ 𝑋 ∈ 𝐵) → 0 ≤ (𝐹‘𝑋)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1569 ∈ wcel 2144 class class class wbr 5102 ‘cfv 6543 (class class class)co 7424 ℝcr 11206 0cc0 11207 +∞cpnf 11347 ≤ cle 11351 [,)cico 13485 Basecbs 17396 AbsValcabv 21074 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5327 ax-pr 5391 ax-un 7755 ax-cnex 11263 ax-resscn 11264 ax-1cn 11265 ax-addrcl 11268 ax-rnegex 11278 ax-cnre 11280 ax-pre-lttri 11281 ax-pre-lttrn 11282 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3848 df-ss 3897 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-opab 5167 df-mpt 5186 df-id 5546 df-po 5559 df-so 5560 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-iota 6497 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-ov 7427 df-oprab 7428 df-mpo 7429 df-er 8725 df-map 8857 df-en 8982 df-dom 8983 df-sdom 8984 df-pnf 11352 df-mnf 11353 df-xr 11354 df-ltxr 11355 df-le 11356 df-ico 13489 df-abv 21075 |
| This theorem is used by: abvgt0 21086 abvneg 21092 abvcxp 27951 ostth2lem2 27970 fiabv 43737 |
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