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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 13488 | . . . . 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 13488 | . . . . 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 13331 | . 2 ⊢ (𝜑 → (𝐴 +𝑒 𝐵) ∈ ℝ*) |
| 10 | 3 | simprd 500 | . . 3 ⊢ (𝜑 → 0 ≤ 𝐴) |
| 11 | 7 | simprd 500 | . . 3 ⊢ (𝜑 → 0 ≤ 𝐵) |
| 12 | xaddge0 13288 | . . 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 13488 | . 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 |
| This proof depends on syntax axioms: → wi 4 ∧ wa 400 ∈ wcel 2143 class class class wbr 5109 (class class class)co 7410 0cc0 11104 +∞cpnf 11244 ℝ*cxr 11246 ≤ cle 11248 +𝑒 cxad 13139 [,]cicc 13379 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-sep 5257 ax-nul 5269 ax-pow 5336 ax-pr 5404 ax-un 7732 ax-cnex 11160 ax-resscn 11161 ax-1cn 11162 ax-icn 11163 ax-addcl 11164 ax-addrcl 11165 ax-mulcl 11166 ax-mulrcl 11167 ax-mulcom 11168 ax-addass 11169 ax-mulass 11170 ax-distr 11171 ax-i2m1 11172 ax-1ne0 11173 ax-1rid 11174 ax-rnegex 11175 ax-rrecex 11176 ax-cnre 11177 ax-pre-lttri 11178 ax-pre-lttrn 11179 ax-pre-ltadd 11180 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-nel 3065 df-ral 3080 df-rex 3090 df-rab 3417 df-v 3457 df-sbc 3745 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-nul 4287 df-if 4488 df-pw 4564 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4873 df-iun 4958 df-br 5110 df-opab 5174 df-mpt 5193 df-id 5556 df-po 5569 df-so 5570 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-rn 5672 df-res 5673 df-ima 5674 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-ov 7413 df-oprab 7414 df-mpo 7415 df-1st 7982 df-2nd 7983 df-er 8690 df-en 8940 df-dom 8941 df-sdom 8942 df-pnf 11249 df-mnf 11250 df-xr 11251 df-ltxr 11252 df-le 11253 df-xadd 13142 df-icc 13383 |
| This theorem is used by: omssubadd 34699 |
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