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Mirrors > Home > ILE Home > Th. List > ser0f | GIF version |
Description: A zero-valued infinite series is equal to the constant zero function. (Contributed by Mario Carneiro, 8-Feb-2014.) |
Ref | Expression |
---|---|
ser0.1 | ⊢ 𝑍 = (ℤ≥‘𝑀) |
Ref | Expression |
---|---|
ser0f | ⊢ (𝑀 ∈ ℤ → seq𝑀( + , (𝑍 × {0})) = (𝑍 × {0})) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ser0.1 | . . . . 5 ⊢ 𝑍 = (ℤ≥‘𝑀) | |
2 | 1 | ser0 10422 | . . . 4 ⊢ (𝑘 ∈ 𝑍 → (seq𝑀( + , (𝑍 × {0}))‘𝑘) = 0) |
3 | c0ex 7874 | . . . . 5 ⊢ 0 ∈ V | |
4 | 3 | fvconst2 5685 | . . . 4 ⊢ (𝑘 ∈ 𝑍 → ((𝑍 × {0})‘𝑘) = 0) |
5 | 2, 4 | eqtr4d 2193 | . . 3 ⊢ (𝑘 ∈ 𝑍 → (seq𝑀( + , (𝑍 × {0}))‘𝑘) = ((𝑍 × {0})‘𝑘)) |
6 | 5 | rgen 2510 | . 2 ⊢ ∀𝑘 ∈ 𝑍 (seq𝑀( + , (𝑍 × {0}))‘𝑘) = ((𝑍 × {0})‘𝑘) |
7 | eqid 2157 | . . . . . 6 ⊢ (ℤ≥‘𝑀) = (ℤ≥‘𝑀) | |
8 | id 19 | . . . . . 6 ⊢ (𝑀 ∈ ℤ → 𝑀 ∈ ℤ) | |
9 | 1 | eleq2i 2224 | . . . . . . . 8 ⊢ (𝑘 ∈ 𝑍 ↔ 𝑘 ∈ (ℤ≥‘𝑀)) |
10 | 0cnd 7873 | . . . . . . . . 9 ⊢ (𝑘 ∈ 𝑍 → 0 ∈ ℂ) | |
11 | 4, 10 | eqeltrd 2234 | . . . . . . . 8 ⊢ (𝑘 ∈ 𝑍 → ((𝑍 × {0})‘𝑘) ∈ ℂ) |
12 | 9, 11 | sylbir 134 | . . . . . . 7 ⊢ (𝑘 ∈ (ℤ≥‘𝑀) → ((𝑍 × {0})‘𝑘) ∈ ℂ) |
13 | 12 | adantl 275 | . . . . . 6 ⊢ ((𝑀 ∈ ℤ ∧ 𝑘 ∈ (ℤ≥‘𝑀)) → ((𝑍 × {0})‘𝑘) ∈ ℂ) |
14 | 7, 8, 13 | serf 10382 | . . . . 5 ⊢ (𝑀 ∈ ℤ → seq𝑀( + , (𝑍 × {0})):(ℤ≥‘𝑀)⟶ℂ) |
15 | 14 | ffnd 5322 | . . . 4 ⊢ (𝑀 ∈ ℤ → seq𝑀( + , (𝑍 × {0})) Fn (ℤ≥‘𝑀)) |
16 | 1 | fneq2i 5267 | . . . 4 ⊢ (seq𝑀( + , (𝑍 × {0})) Fn 𝑍 ↔ seq𝑀( + , (𝑍 × {0})) Fn (ℤ≥‘𝑀)) |
17 | 15, 16 | sylibr 133 | . . 3 ⊢ (𝑀 ∈ ℤ → seq𝑀( + , (𝑍 × {0})) Fn 𝑍) |
18 | 3 | fconst 5367 | . . . 4 ⊢ (𝑍 × {0}):𝑍⟶{0} |
19 | ffn 5321 | . . . 4 ⊢ ((𝑍 × {0}):𝑍⟶{0} → (𝑍 × {0}) Fn 𝑍) | |
20 | 18, 19 | ax-mp 5 | . . 3 ⊢ (𝑍 × {0}) Fn 𝑍 |
21 | eqfnfv 5567 | . . 3 ⊢ ((seq𝑀( + , (𝑍 × {0})) Fn 𝑍 ∧ (𝑍 × {0}) Fn 𝑍) → (seq𝑀( + , (𝑍 × {0})) = (𝑍 × {0}) ↔ ∀𝑘 ∈ 𝑍 (seq𝑀( + , (𝑍 × {0}))‘𝑘) = ((𝑍 × {0})‘𝑘))) | |
22 | 17, 20, 21 | sylancl 410 | . 2 ⊢ (𝑀 ∈ ℤ → (seq𝑀( + , (𝑍 × {0})) = (𝑍 × {0}) ↔ ∀𝑘 ∈ 𝑍 (seq𝑀( + , (𝑍 × {0}))‘𝑘) = ((𝑍 × {0})‘𝑘))) |
23 | 6, 22 | mpbiri 167 | 1 ⊢ (𝑀 ∈ ℤ → seq𝑀( + , (𝑍 × {0})) = (𝑍 × {0})) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ↔ wb 104 = wceq 1335 ∈ wcel 2128 ∀wral 2435 {csn 3561 × cxp 4586 Fn wfn 5167 ⟶wf 5168 ‘cfv 5172 ℂcc 7732 0cc0 7734 + caddc 7737 ℤcz 9172 ℤ≥cuz 9444 seqcseq 10353 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1427 ax-7 1428 ax-gen 1429 ax-ie1 1473 ax-ie2 1474 ax-8 1484 ax-10 1485 ax-11 1486 ax-i12 1487 ax-bndl 1489 ax-4 1490 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-13 2130 ax-14 2131 ax-ext 2139 ax-coll 4081 ax-sep 4084 ax-nul 4092 ax-pow 4137 ax-pr 4171 ax-un 4395 ax-setind 4498 ax-iinf 4549 ax-cnex 7825 ax-resscn 7826 ax-1cn 7827 ax-1re 7828 ax-icn 7829 ax-addcl 7830 ax-addrcl 7831 ax-mulcl 7832 ax-addcom 7834 ax-addass 7836 ax-distr 7838 ax-i2m1 7839 ax-0lt1 7840 ax-0id 7842 ax-rnegex 7843 ax-cnre 7845 ax-pre-ltirr 7846 ax-pre-ltwlin 7847 ax-pre-lttrn 7848 ax-pre-ltadd 7850 |
This theorem depends on definitions: df-bi 116 df-3or 964 df-3an 965 df-tru 1338 df-fal 1341 df-nf 1441 df-sb 1743 df-eu 2009 df-mo 2010 df-clab 2144 df-cleq 2150 df-clel 2153 df-nfc 2288 df-ne 2328 df-nel 2423 df-ral 2440 df-rex 2441 df-reu 2442 df-rab 2444 df-v 2714 df-sbc 2938 df-csb 3032 df-dif 3104 df-un 3106 df-in 3108 df-ss 3115 df-nul 3396 df-pw 3546 df-sn 3567 df-pr 3568 df-op 3570 df-uni 3775 df-int 3810 df-iun 3853 df-br 3968 df-opab 4028 df-mpt 4029 df-tr 4065 df-id 4255 df-iord 4328 df-on 4330 df-ilim 4331 df-suc 4333 df-iom 4552 df-xp 4594 df-rel 4595 df-cnv 4596 df-co 4597 df-dm 4598 df-rn 4599 df-res 4600 df-ima 4601 df-iota 5137 df-fun 5174 df-fn 5175 df-f 5176 df-f1 5177 df-fo 5178 df-f1o 5179 df-fv 5180 df-riota 5782 df-ov 5829 df-oprab 5830 df-mpo 5831 df-1st 6090 df-2nd 6091 df-recs 6254 df-frec 6340 df-pnf 7916 df-mnf 7917 df-xr 7918 df-ltxr 7919 df-le 7920 df-sub 8052 df-neg 8053 df-inn 8839 df-n0 9096 df-z 9173 df-uz 9445 df-fz 9919 df-fzo 10051 df-seqfrec 10354 |
This theorem is referenced by: serclim0 11213 |
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