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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 8623 | . 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 2200 class class class wbr 4082 (class class class)co 5994 ℝcr 7986 0cc0 7987 + caddc 7990 < clt 8169 |
| 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4201 ax-pow 4257 ax-pr 4292 ax-un 4521 ax-setind 4626 ax-cnex 8078 ax-resscn 8079 ax-1cn 8080 ax-1re 8081 ax-icn 8082 ax-addcl 8083 ax-addrcl 8084 ax-mulcl 8085 ax-addcom 8087 ax-addass 8089 ax-i2m1 8092 ax-0id 8095 ax-rnegex 8096 ax-pre-lttrn 8101 ax-pre-ltadd 8103 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-rab 2517 df-v 2801 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3888 df-br 4083 df-opab 4145 df-xp 4722 df-iota 5274 df-fv 5322 df-ov 5997 df-pnf 8171 df-mnf 8172 df-ltxr 8174 |
| This theorem is referenced by: eqneg 8867 2pos 9189 3pos 9192 4pos 9195 5pos 9198 6pos 9199 7pos 9200 8pos 9201 9pos 9202 |
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