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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 2760 | . . 3 ⊢ (𝑘 ∈ 𝐴 ↦ 𝐵) = (𝑘 ∈ 𝐴 ↦ 𝐵) | |
| 5 | 2, 3, 4 | fmptdf 7105 | . 2 ⊢ (𝜑 → (𝑘 ∈ 𝐴 ↦ 𝐵):𝐴⟶(0[,]+∞)) |
| 6 | sge0pnfmpt.p | . . . 4 ⊢ (𝜑 → ∃𝑘 ∈ 𝐴 𝐵 = +∞) | |
| 7 | eqcom 2767 | . . . . 5 ⊢ (𝐵 = +∞ ↔ +∞ = 𝐵) | |
| 8 | 7 | rexbii 3109 | . . . 4 ⊢ (∃𝑘 ∈ 𝐴 𝐵 = +∞ ↔ ∃𝑘 ∈ 𝐴 +∞ = 𝐵) |
| 9 | 6, 8 | sylib 221 | . . 3 ⊢ (𝜑 → ∃𝑘 ∈ 𝐴 +∞ = 𝐵) |
| 10 | pnfex 11333 | . . . 4 ⊢ +∞ ∈ V | |
| 11 | 10 | a1i 11 | . . 3 ⊢ (𝜑 → +∞ ∈ V) |
| 12 | 4, 9, 11 | elrnmptd 5941 | . 2 ⊢ (𝜑 → +∞ ∈ ran (𝑘 ∈ 𝐴 ↦ 𝐵)) |
| 13 | 1, 5, 12 | sge0pnfval 47305 | 1 ⊢ (𝜑 → (Σ^‘(𝑘 ∈ 𝐴 ↦ 𝐵)) = +∞) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1570 Ⅎwnf 1816 ∈ wcel 2145 ∃wrex 3086 Vcvv 3450 ↦ cmpt 5185 ‘cfv 6527 (class class class)co 7408 0cc0 11171 +∞cpnf 11311 [,]cicc 13448 Σ^csumge0 47294 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7734 ax-cnex 11227 ax-resscn 11228 ax-pre-lttri 11245 ax-pre-lttrn 11246 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-id 5542 df-po 5555 df-so 5556 df-xp 5653 df-rel 5654 df-cnv 5655 df-co 5656 df-dm 5657 df-rn 5658 df-res 5659 df-ima 5660 df-pred 6293 df-iota 6483 df-fun 6529 df-fn 6530 df-f 6531 df-f1 6532 df-fo 6533 df-f1o 6534 df-fv 6535 df-ov 7411 df-oprab 7412 df-mpo 7413 df-frecs 8277 df-wrecs 8308 df-recs 8357 df-rdg 8396 df-er 8695 df-en 8952 df-dom 8953 df-sdom 8954 df-sup 9412 df-pnf 11316 df-mnf 11317 df-xr 11318 df-ltxr 11319 df-seq 14113 df-sum 15821 df-sumge0 47295 |
| This theorem is used by: voliunsge0lem 47404 |
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