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| Mirrors > Home > MPE Home > Th. List > Mathboxes > sge0pnfmpt | Structured version Visualization version GIF version | ||
| Description: If a term in the sum of nonnegative extended reals is +∞, then the value of the sum is +∞. (Contributed by Glauco Siliprandi, 3-Mar-2021.) |
| Ref | Expression |
|---|---|
| sge0pnfmpt.k | ⊢ Ⅎ𝑘𝜑 |
| sge0pnfmpt.a | ⊢ (𝜑 → 𝐴 ∈ 𝑉) |
| sge0pnfmpt.b | ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ∈ (0[,]+∞)) |
| sge0pnfmpt.p | ⊢ (𝜑 → ∃𝑘 ∈ 𝐴 𝐵 = +∞) |
| Ref | Expression |
|---|---|
| sge0pnfmpt | ⊢ (𝜑 → (Σ^‘(𝑘 ∈ 𝐴 ↦ 𝐵)) = +∞) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sge0pnfmpt.a | . 2 ⊢ (𝜑 → 𝐴 ∈ 𝑉) | |
| 2 | sge0pnfmpt.k | . . 3 ⊢ Ⅎ𝑘𝜑 | |
| 3 | sge0pnfmpt.b | . . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ∈ (0[,]+∞)) | |
| 4 | eqid 2737 | . . 3 ⊢ (𝑘 ∈ 𝐴 ↦ 𝐵) = (𝑘 ∈ 𝐴 ↦ 𝐵) | |
| 5 | 2, 3, 4 | fmptdf 7073 | . 2 ⊢ (𝜑 → (𝑘 ∈ 𝐴 ↦ 𝐵):𝐴⟶(0[,]+∞)) |
| 6 | sge0pnfmpt.p | . . . 4 ⊢ (𝜑 → ∃𝑘 ∈ 𝐴 𝐵 = +∞) | |
| 7 | eqcom 2744 | . . . . 5 ⊢ (𝐵 = +∞ ↔ +∞ = 𝐵) | |
| 8 | 7 | rexbii 3085 | . . . 4 ⊢ (∃𝑘 ∈ 𝐴 𝐵 = +∞ ↔ ∃𝑘 ∈ 𝐴 +∞ = 𝐵) |
| 9 | 6, 8 | sylib 218 | . . 3 ⊢ (𝜑 → ∃𝑘 ∈ 𝐴 +∞ = 𝐵) |
| 10 | pnfex 11199 | . . . 4 ⊢ +∞ ∈ V | |
| 11 | 10 | a1i 11 | . . 3 ⊢ (𝜑 → +∞ ∈ V) |
| 12 | 4, 9, 11 | elrnmptd 5922 | . 2 ⊢ (𝜑 → +∞ ∈ ran (𝑘 ∈ 𝐴 ↦ 𝐵)) |
| 13 | 1, 5, 12 | sge0pnfval 46760 | 1 ⊢ (𝜑 → (Σ^‘(𝑘 ∈ 𝐴 ↦ 𝐵)) = +∞) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1542 Ⅎwnf 1785 ∈ wcel 2114 ∃wrex 3062 Vcvv 3442 ↦ cmpt 5181 ‘cfv 6502 (class class class)co 7370 0cc0 11040 +∞cpnf 11177 [,]cicc 13278 Σ^csumge0 46749 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5226 ax-sep 5245 ax-nul 5255 ax-pow 5314 ax-pr 5381 ax-un 7692 ax-cnex 11096 ax-resscn 11097 ax-pre-lttri 11114 ax-pre-lttrn 11115 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rmo 3352 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-id 5529 df-po 5542 df-so 5543 df-xp 5640 df-rel 5641 df-cnv 5642 df-co 5643 df-dm 5644 df-rn 5645 df-res 5646 df-ima 5647 df-pred 6269 df-iota 6458 df-fun 6504 df-fn 6505 df-f 6506 df-f1 6507 df-fo 6508 df-f1o 6509 df-fv 6510 df-ov 7373 df-oprab 7374 df-mpo 7375 df-frecs 8235 df-wrecs 8266 df-recs 8315 df-rdg 8353 df-er 8647 df-en 8898 df-dom 8899 df-sdom 8900 df-sup 9359 df-pnf 11182 df-mnf 11183 df-xr 11184 df-ltxr 11185 df-seq 13939 df-sum 15624 df-sumge0 46750 |
| This theorem is referenced by: voliunsge0lem 46859 |
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