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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 2770 | . . 3 ⊢ (𝑘 ∈ 𝐴 ↦ 𝐵) = (𝑘 ∈ 𝐴 ↦ 𝐵) | |
| 5 | 2, 3, 4 | fmptdf 7116 | . 2 ⊢ (𝜑 → (𝑘 ∈ 𝐴 ↦ 𝐵):𝐴⟶(0[,]+∞)) |
| 6 | sge0pnfmpt.p | . . . 4 ⊢ (𝜑 → ∃𝑘 ∈ 𝐴 𝐵 = +∞) | |
| 7 | eqcom 2777 | . . . . 5 ⊢ (𝐵 = +∞ ↔ +∞ = 𝐵) | |
| 8 | 7 | rexbii 3119 | . . . 4 ⊢ (∃𝑘 ∈ 𝐴 𝐵 = +∞ ↔ ∃𝑘 ∈ 𝐴 +∞ = 𝐵) |
| 9 | 6, 8 | sylib 221 | . . 3 ⊢ (𝜑 → ∃𝑘 ∈ 𝐴 +∞ = 𝐵) |
| 10 | pnfex 11265 | . . . 4 ⊢ +∞ ∈ V | |
| 11 | 10 | a1i 11 | . . 3 ⊢ (𝜑 → +∞ ∈ V) |
| 12 | 4, 9, 11 | elrnmptd 5957 | . 2 ⊢ (𝜑 → +∞ ∈ ran (𝑘 ∈ 𝐴 ↦ 𝐵)) |
| 13 | 1, 5, 12 | sge0pnfval 47039 | 1 ⊢ (𝜑 → (Σ^‘(𝑘 ∈ 𝐴 ↦ 𝐵)) = +∞) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 = wceq 1568 Ⅎwnf 1811 ∈ wcel 2150 ∃wrex 3096 Vcvv 3462 ↦ cmpt 5197 ‘cfv 6540 (class class class)co 7414 0cc0 11103 +∞cpnf 11243 [,]cicc 13378 Σ^csumge0 47028 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1823 ax-4 1837 ax-5 1938 ax-6 1995 ax-7 2036 ax-8 2152 ax-9 2160 ax-10 2183 ax-11 2199 ax-12 2220 ax-ext 2742 ax-rep 5243 ax-sep 5262 ax-nul 5274 ax-pow 5340 ax-pr 5408 ax-un 7736 ax-cnex 11159 ax-resscn 11160 ax-pre-lttri 11177 ax-pre-lttrn 11178 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1571 df-fal 1581 df-ex 1808 df-nf 1812 df-sb 2099 df-mo 2574 df-eu 2604 df-clab 2749 df-cleq 2762 df-clel 2845 df-nfc 2919 df-ne 2966 df-nel 3072 df-ral 3087 df-rex 3097 df-rmo 3376 df-reu 3377 df-rab 3424 df-v 3464 df-sbc 3753 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 4878 df-iun 4963 df-br 5115 df-opab 5179 df-mpt 5198 df-id 5560 df-po 5573 df-so 5574 df-xp 5671 df-rel 5672 df-cnv 5673 df-co 5674 df-dm 5675 df-rn 5676 df-res 5677 df-ima 5678 df-pred 6306 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-ov 7417 df-oprab 7418 df-mpo 7419 df-frecs 8281 df-wrecs 8312 df-recs 8361 df-rdg 8400 df-er 8697 df-en 8947 df-dom 8948 df-sdom 8949 df-sup 9405 df-pnf 11248 df-mnf 11249 df-xr 11250 df-ltxr 11251 df-seq 14041 df-sum 15741 df-sumge0 47029 |
| This theorem is referenced by: voliunsge0lem 47138 |
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