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| Mirrors > Home > ILE Home > Th. List > addgt0ii | GIF version | ||
| Description: Addition of 2 positive numbers is positive. (Contributed by NM, 18-May-1999.) |
| Ref | Expression |
|---|---|
| lt2.1 | ⊢ 𝐴 ∈ ℝ |
| lt2.2 | ⊢ 𝐵 ∈ ℝ |
| addgt0i.3 | ⊢ 0 < 𝐴 |
| addgt0i.4 | ⊢ 0 < 𝐵 |
| Ref | Expression |
|---|---|
| addgt0ii | ⊢ 0 < (𝐴 + 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | addgt0i.3 | . 2 ⊢ 0 < 𝐴 | |
| 2 | addgt0i.4 | . 2 ⊢ 0 < 𝐵 | |
| 3 | lt2.1 | . . 3 ⊢ 𝐴 ∈ ℝ | |
| 4 | lt2.2 | . . 3 ⊢ 𝐵 ∈ ℝ | |
| 5 | 3, 4 | addgt0i 8779 | . 2 ⊢ ((0 < 𝐴 ∧ 0 < 𝐵) → 0 < (𝐴 + 𝐵)) |
| 6 | 1, 2, 5 | mp2an 426 | 1 ⊢ 0 < (𝐴 + 𝐵) |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2205 class class class wbr 4114 (class class class)co 6058 ℝcr 8142 0cc0 8143 + caddc 8146 < clt 8324 |
| 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 2207 ax-14 2208 ax-ext 2216 ax-sep 4233 ax-pow 4292 ax-pr 4327 ax-un 4559 ax-setind 4664 ax-cnex 8234 ax-resscn 8235 ax-1cn 8236 ax-1re 8237 ax-icn 8238 ax-addcl 8239 ax-addrcl 8240 ax-mulcl 8241 ax-addcom 8243 ax-addass 8245 ax-i2m1 8248 ax-0id 8251 ax-rnegex 8252 ax-pre-lttrn 8257 ax-pre-ltadd 8259 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2085 df-mo 2086 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ne 2415 df-nel 2510 df-ral 2527 df-rex 2528 df-rab 2531 df-v 2817 df-dif 3216 df-un 3218 df-in 3220 df-ss 3227 df-pw 3676 df-sn 3700 df-pr 3701 df-op 3703 df-uni 3920 df-br 4115 df-opab 4177 df-xp 4760 df-iota 5317 df-fv 5365 df-ov 6061 df-pnf 8326 df-mnf 8327 df-ltxr 8329 |
| This theorem is referenced by: eqneg 9023 2pos 9345 3pos 9348 4pos 9351 5pos 9354 6pos 9355 7pos 9356 8pos 9357 9pos 9358 |
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