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| Mirrors > Home > MPE Home > Th. List > Mathboxes > xrge0addcld | Structured version Visualization version GIF version | ||
| Description: Nonnegative extended reals are closed under addition. (Contributed by Thierry Arnoux, 16-Sep-2019.) |
| Ref | Expression |
|---|---|
| xrge0addcld.a | ⊢ (𝜑 → 𝐴 ∈ (0[,]+∞)) |
| xrge0addcld.b | ⊢ (𝜑 → 𝐵 ∈ (0[,]+∞)) |
| Ref | Expression |
|---|---|
| xrge0addcld | ⊢ (𝜑 → (𝐴 +𝑒 𝐵) ∈ (0[,]+∞)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | xrge0addcld.a | . . . . 5 ⊢ (𝜑 → 𝐴 ∈ (0[,]+∞)) | |
| 2 | elxrge0 13484 | . . . . 5 ⊢ (𝐴 ∈ (0[,]+∞) ↔ (𝐴 ∈ ℝ* ∧ 0 ≤ 𝐴)) | |
| 3 | 1, 2 | sylib 221 | . . . 4 ⊢ (𝜑 → (𝐴 ∈ ℝ* ∧ 0 ≤ 𝐴)) |
| 4 | 3 | simpld 499 | . . 3 ⊢ (𝜑 → 𝐴 ∈ ℝ*) |
| 5 | xrge0addcld.b | . . . . 5 ⊢ (𝜑 → 𝐵 ∈ (0[,]+∞)) | |
| 6 | elxrge0 13484 | . . . . 5 ⊢ (𝐵 ∈ (0[,]+∞) ↔ (𝐵 ∈ ℝ* ∧ 0 ≤ 𝐵)) | |
| 7 | 5, 6 | sylib 221 | . . . 4 ⊢ (𝜑 → (𝐵 ∈ ℝ* ∧ 0 ≤ 𝐵)) |
| 8 | 7 | simpld 499 | . . 3 ⊢ (𝜑 → 𝐵 ∈ ℝ*) |
| 9 | 4, 8 | xaddcld 13327 | . 2 ⊢ (𝜑 → (𝐴 +𝑒 𝐵) ∈ ℝ*) |
| 10 | 3 | simprd 500 | . . 3 ⊢ (𝜑 → 0 ≤ 𝐴) |
| 11 | 7 | simprd 500 | . . 3 ⊢ (𝜑 → 0 ≤ 𝐵) |
| 12 | xaddge0 13284 | . . 3 ⊢ (((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) ∧ (0 ≤ 𝐴 ∧ 0 ≤ 𝐵)) → 0 ≤ (𝐴 +𝑒 𝐵)) | |
| 13 | 4, 8, 10, 11, 12 | syl22anc 851 | . 2 ⊢ (𝜑 → 0 ≤ (𝐴 +𝑒 𝐵)) |
| 14 | elxrge0 13484 | . 2 ⊢ ((𝐴 +𝑒 𝐵) ∈ (0[,]+∞) ↔ ((𝐴 +𝑒 𝐵) ∈ ℝ* ∧ 0 ≤ (𝐴 +𝑒 𝐵))) | |
| 15 | 9, 13, 14 | sylanbrc 594 | 1 ⊢ (𝜑 → (𝐴 +𝑒 𝐵) ∈ (0[,]+∞)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 ∈ wcel 2149 class class class wbr 5113 (class class class)co 7411 0cc0 11100 +∞cpnf 11240 ℝ*cxr 11242 ≤ cle 11244 +𝑒 cxad 13135 [,]cicc 13375 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-sep 5261 ax-nul 5271 ax-pow 5337 ax-pr 5405 ax-un 7733 ax-cnex 11156 ax-resscn 11157 ax-1cn 11158 ax-icn 11159 ax-addcl 11160 ax-addrcl 11161 ax-mulcl 11162 ax-mulrcl 11163 ax-mulcom 11164 ax-addass 11165 ax-mulass 11166 ax-distr 11167 ax-i2m1 11168 ax-1ne0 11169 ax-1rid 11170 ax-rnegex 11171 ax-rrecex 11172 ax-cnre 11173 ax-pre-lttri 11174 ax-pre-lttrn 11175 ax-pre-ltadd 11176 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-nel 3071 df-ral 3086 df-rex 3096 df-rab 3424 df-v 3465 df-sbc 3754 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-nul 4295 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4877 df-iun 4962 df-br 5114 df-opab 5178 df-mpt 5197 df-id 5557 df-po 5570 df-so 5571 df-xp 5668 df-rel 5669 df-cnv 5670 df-co 5671 df-dm 5672 df-rn 5673 df-res 5674 df-ima 5675 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-ov 7414 df-oprab 7415 df-mpo 7416 df-1st 7986 df-2nd 7987 df-er 8694 df-en 8944 df-dom 8945 df-sdom 8946 df-pnf 11245 df-mnf 11246 df-xr 11247 df-ltxr 11248 df-le 11249 df-xadd 13138 df-icc 13379 |
| This theorem is referenced by: omssubadd 34635 |
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