| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > ILE Home > Th. List > addgtge0 | GIF version | ||
| Description: The sum of nonnegative and positive numbers is positive. (Contributed by NM, 28-Dec-2005.) (Proof shortened by Andrew Salmon, 19-Nov-2011.) |
| Ref | Expression |
|---|---|
| addgtge0 | ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (0 < 𝐴 ∧ 0 ≤ 𝐵)) → 0 < (𝐴 + 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 00id 8363 | . 2 ⊢ (0 + 0) = 0 | |
| 2 | 0re 8222 | . . . 4 ⊢ 0 ∈ ℝ | |
| 3 | ltleadd 8669 | . . . 4 ⊢ (((0 ∈ ℝ ∧ 0 ∈ ℝ) ∧ (𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ)) → ((0 < 𝐴 ∧ 0 ≤ 𝐵) → (0 + 0) < (𝐴 + 𝐵))) | |
| 4 | 2, 2, 3 | mpanl12 436 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → ((0 < 𝐴 ∧ 0 ≤ 𝐵) → (0 + 0) < (𝐴 + 𝐵))) |
| 5 | 4 | imp 124 | . 2 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (0 < 𝐴 ∧ 0 ≤ 𝐵)) → (0 + 0) < (𝐴 + 𝐵)) |
| 6 | 1, 5 | eqbrtrrid 4129 | 1 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (0 < 𝐴 ∧ 0 ≤ 𝐵)) → 0 < (𝐴 + 𝐵)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∈ wcel 2202 class class class wbr 4093 (class class class)co 6028 ℝcr 8074 0cc0 8075 + caddc 8078 < clt 8257 ≤ cle 8258 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4212 ax-pow 4270 ax-pr 4305 ax-un 4536 ax-setind 4641 ax-cnex 8166 ax-resscn 8167 ax-1cn 8168 ax-1re 8169 ax-icn 8170 ax-addcl 8171 ax-addrcl 8172 ax-mulcl 8173 ax-addcom 8175 ax-addass 8177 ax-i2m1 8180 ax-0id 8183 ax-rnegex 8184 ax-pre-ltwlin 8188 ax-pre-ltadd 8191 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ne 2404 df-nel 2499 df-ral 2516 df-rex 2517 df-rab 2520 df-v 2805 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-pw 3658 df-sn 3679 df-pr 3680 df-op 3682 df-uni 3899 df-br 4094 df-opab 4156 df-xp 4737 df-cnv 4739 df-iota 5293 df-fv 5341 df-ov 6031 df-pnf 8259 df-mnf 8260 df-xr 8261 df-ltxr 8262 df-le 8263 |
| This theorem is referenced by: addgtge0d 8743 recexaplem2 8875 recp1lt1 9122 resqrexlem1arp 11626 resqrexlemp1rp 11627 resqrexlemglsq 11643 |
| Copyright terms: Public domain | W3C validator |