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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 21122 | . . 3 ⊢ (𝐹 ∈ 𝐴 → 𝐹:𝐵⟶(0[,)+∞)) |
| 4 | 3 | ffvelcdmda 7116 | . 2 ⊢ ((𝐹 ∈ 𝐴 ∧ 𝑋 ∈ 𝐵) → (𝐹‘𝑋) ∈ (0[,)+∞)) |
| 5 | elrege0 13625 | . . 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 1570 ∈ wcel 2147 class class class wbr 5108 ‘cfv 6566 (class class class)co 7451 ℝcr 11238 0cc0 11239 +∞cpnf 11379 ≤ cle 11383 [,)cico 13518 Basecbs 17431 AbsValcabv 21116 |
| 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-sep 5255 ax-nul 5266 ax-pow 5334 ax-pr 5398 ax-un 7783 ax-cnex 11295 ax-resscn 11296 ax-1cn 11297 ax-addrcl 11300 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-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-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-er 8755 df-map 8887 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-abv 21117 |
| This theorem is used by: abvgt0 21128 abvneg 21134 abvcxp 27999 ostth2lem2 28018 fiabv 43866 |
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