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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 2762 | . . 3 ⊢ (𝑘 ∈ 𝐴 ↦ 𝐵) = (𝑘 ∈ 𝐴 ↦ 𝐵) | |
| 5 | 2, 3, 4 | fmptdf 7112 | . 2 ⊢ (𝜑 → (𝑘 ∈ 𝐴 ↦ 𝐵):𝐴⟶(0[,]+∞)) |
| 6 | sge0pnfmpt.p | . . . 4 ⊢ (𝜑 → ∃𝑘 ∈ 𝐴 𝐵 = +∞) | |
| 7 | eqcom 2769 | . . . . 5 ⊢ (𝐵 = +∞ ↔ +∞ = 𝐵) | |
| 8 | 7 | rexbii 3111 | . . . 4 ⊢ (∃𝑘 ∈ 𝐴 𝐵 = +∞ ↔ ∃𝑘 ∈ 𝐴 +∞ = 𝐵) |
| 9 | 6, 8 | sylib 221 | . . 3 ⊢ (𝜑 → ∃𝑘 ∈ 𝐴 +∞ = 𝐵) |
| 10 | pnfex 11268 | . . . 4 ⊢ +∞ ∈ V | |
| 11 | 10 | a1i 11 | . . 3 ⊢ (𝜑 → +∞ ∈ V) |
| 12 | 4, 9, 11 | elrnmptd 5952 | . 2 ⊢ (𝜑 → +∞ ∈ ran (𝑘 ∈ 𝐴 ↦ 𝐵)) |
| 13 | 1, 5, 12 | sge0pnfval 47115 | 1 ⊢ (𝜑 → (Σ^‘(𝑘 ∈ 𝐴 ↦ 𝐵)) = +∞) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 400 = wceq 1569 Ⅎwnf 1812 ∈ wcel 2142 ∃wrex 3088 Vcvv 3454 ↦ cmpt 5191 ‘cfv 6536 (class class class)co 7412 0cc0 11106 +∞cpnf 11246 [,]cicc 13381 Σ^csumge0 47104 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1824 ax-4 1838 ax-5 1939 ax-6 1996 ax-7 2037 ax-8 2144 ax-9 2152 ax-10 2175 ax-11 2191 ax-12 2212 ax-ext 2734 ax-rep 5237 ax-sep 5256 ax-nul 5268 ax-pow 5335 ax-pr 5403 ax-un 7734 ax-cnex 11162 ax-resscn 11163 ax-pre-lttri 11180 ax-pre-lttrn 11181 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1103 df-3an 1104 df-tru 1572 df-fal 1582 df-ex 1809 df-nf 1813 df-sb 2096 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-rmo 3368 df-reu 3369 df-rab 3416 df-v 3456 df-sbc 3744 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-nul 4286 df-if 4487 df-pw 4563 df-sn 4589 df-pr 4591 df-op 4595 df-uni 4872 df-iun 4957 df-br 5109 df-opab 5173 df-mpt 5192 df-id 5555 df-po 5568 df-so 5569 df-xp 5666 df-rel 5667 df-cnv 5668 df-co 5669 df-dm 5670 df-rn 5671 df-res 5672 df-ima 5673 df-pred 6302 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 7415 df-oprab 7416 df-mpo 7417 df-frecs 8276 df-wrecs 8307 df-recs 8356 df-rdg 8395 df-er 8692 df-en 8942 df-dom 8943 df-sdom 8944 df-sup 9400 df-pnf 11251 df-mnf 11252 df-xr 11253 df-ltxr 11254 df-seq 14045 df-sum 15745 df-sumge0 47105 |
| This theorem is used by: voliunsge0lem 47214 |
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