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Mirrors > Home > ILE Home > Th. List > addgt0d | GIF version |
Description: Addition of 2 positive numbers is positive. (Contributed by Mario Carneiro, 27-May-2016.) |
Ref | Expression |
---|---|
leidd.1 | ⊢ (𝜑 → 𝐴 ∈ ℝ) |
ltnegd.2 | ⊢ (𝜑 → 𝐵 ∈ ℝ) |
addgt0d.3 | ⊢ (𝜑 → 0 < 𝐴) |
addgt0d.4 | ⊢ (𝜑 → 0 < 𝐵) |
Ref | Expression |
---|---|
addgt0d | ⊢ (𝜑 → 0 < (𝐴 + 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | leidd.1 | . 2 ⊢ (𝜑 → 𝐴 ∈ ℝ) | |
2 | ltnegd.2 | . 2 ⊢ (𝜑 → 𝐵 ∈ ℝ) | |
3 | 0red 7908 | . . 3 ⊢ (𝜑 → 0 ∈ ℝ) | |
4 | addgt0d.3 | . . 3 ⊢ (𝜑 → 0 < 𝐴) | |
5 | 3, 1, 4 | ltled 8025 | . 2 ⊢ (𝜑 → 0 ≤ 𝐴) |
6 | addgt0d.4 | . 2 ⊢ (𝜑 → 0 < 𝐵) | |
7 | 1, 2, 5, 6 | addgegt0d 8425 | 1 ⊢ (𝜑 → 0 < (𝐴 + 𝐵)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∈ wcel 2141 class class class wbr 3987 (class class class)co 5850 ℝcr 7760 0cc0 7761 + caddc 7764 < clt 7941 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 609 ax-in2 610 ax-io 704 ax-5 1440 ax-7 1441 ax-gen 1442 ax-ie1 1486 ax-ie2 1487 ax-8 1497 ax-10 1498 ax-11 1499 ax-i12 1500 ax-bndl 1502 ax-4 1503 ax-17 1519 ax-i9 1523 ax-ial 1527 ax-i5r 1528 ax-13 2143 ax-14 2144 ax-ext 2152 ax-sep 4105 ax-pow 4158 ax-pr 4192 ax-un 4416 ax-setind 4519 ax-cnex 7852 ax-resscn 7853 ax-1cn 7854 ax-1re 7855 ax-icn 7856 ax-addcl 7857 ax-addrcl 7858 ax-mulcl 7859 ax-addcom 7861 ax-addass 7863 ax-i2m1 7866 ax-0id 7869 ax-rnegex 7870 ax-pre-ltirr 7873 ax-pre-ltwlin 7874 ax-pre-lttrn 7875 ax-pre-ltadd 7877 |
This theorem depends on definitions: df-bi 116 df-3an 975 df-tru 1351 df-fal 1354 df-nf 1454 df-sb 1756 df-eu 2022 df-mo 2023 df-clab 2157 df-cleq 2163 df-clel 2166 df-nfc 2301 df-ne 2341 df-nel 2436 df-ral 2453 df-rex 2454 df-rab 2457 df-v 2732 df-dif 3123 df-un 3125 df-in 3127 df-ss 3134 df-pw 3566 df-sn 3587 df-pr 3588 df-op 3590 df-uni 3795 df-br 3988 df-opab 4049 df-xp 4615 df-cnv 4617 df-iota 5158 df-fv 5204 df-ov 5853 df-pnf 7943 df-mnf 7944 df-xr 7945 df-ltxr 7946 df-le 7947 |
This theorem is referenced by: nnoddm1d2 11856 pythagtriplem11 12215 pythagtriplem12 12216 pythagtriplem13 12217 pythagtriplem14 12218 pythagtriplem16 12220 |
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