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Mirrors > Home > ILE Home > Th. List > iser0f | GIF version |
Description: A zero-valued infinite series is equal to the constant zero function. (Contributed by Jim Kingdon, 19-Aug-2021.) |
Ref | Expression |
---|---|
iser0.1 | ⊢ 𝑍 = (ℤ≥‘𝑀) |
Ref | Expression |
---|---|
iser0f | ⊢ (𝑀 ∈ ℤ → seq𝑀( + , (𝑍 × {0}), ℂ) = (𝑍 × {0})) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | iser0.1 | . . . . 5 ⊢ 𝑍 = (ℤ≥‘𝑀) | |
2 | 1 | iser0 9471 | . . . 4 ⊢ (𝑘 ∈ 𝑍 → (seq𝑀( + , (𝑍 × {0}), ℂ)‘𝑘) = 0) |
3 | c0ex 7113 | . . . . 5 ⊢ 0 ∈ V | |
4 | 3 | fvconst2 5398 | . . . 4 ⊢ (𝑘 ∈ 𝑍 → ((𝑍 × {0})‘𝑘) = 0) |
5 | 2, 4 | eqtr4d 2116 | . . 3 ⊢ (𝑘 ∈ 𝑍 → (seq𝑀( + , (𝑍 × {0}), ℂ)‘𝑘) = ((𝑍 × {0})‘𝑘)) |
6 | 5 | rgen 2416 | . 2 ⊢ ∀𝑘 ∈ 𝑍 (seq𝑀( + , (𝑍 × {0}), ℂ)‘𝑘) = ((𝑍 × {0})‘𝑘) |
7 | id 19 | . . . . 5 ⊢ (𝑀 ∈ ℤ → 𝑀 ∈ ℤ) | |
8 | cnex 7097 | . . . . . 6 ⊢ ℂ ∈ V | |
9 | 8 | a1i 9 | . . . . 5 ⊢ (𝑀 ∈ ℤ → ℂ ∈ V) |
10 | 1 | eleq2i 2145 | . . . . . . 7 ⊢ (𝑘 ∈ 𝑍 ↔ 𝑘 ∈ (ℤ≥‘𝑀)) |
11 | 0cnd 7112 | . . . . . . . 8 ⊢ (𝑘 ∈ 𝑍 → 0 ∈ ℂ) | |
12 | 4, 11 | eqeltrd 2155 | . . . . . . 7 ⊢ (𝑘 ∈ 𝑍 → ((𝑍 × {0})‘𝑘) ∈ ℂ) |
13 | 10, 12 | sylbir 133 | . . . . . 6 ⊢ (𝑘 ∈ (ℤ≥‘𝑀) → ((𝑍 × {0})‘𝑘) ∈ ℂ) |
14 | 13 | adantl 271 | . . . . 5 ⊢ ((𝑀 ∈ ℤ ∧ 𝑘 ∈ (ℤ≥‘𝑀)) → ((𝑍 × {0})‘𝑘) ∈ ℂ) |
15 | addcl 7098 | . . . . . 6 ⊢ ((𝑘 ∈ ℂ ∧ 𝑣 ∈ ℂ) → (𝑘 + 𝑣) ∈ ℂ) | |
16 | 15 | adantl 271 | . . . . 5 ⊢ ((𝑀 ∈ ℤ ∧ (𝑘 ∈ ℂ ∧ 𝑣 ∈ ℂ)) → (𝑘 + 𝑣) ∈ ℂ) |
17 | 7, 9, 14, 16 | iseqfn 9441 | . . . 4 ⊢ (𝑀 ∈ ℤ → seq𝑀( + , (𝑍 × {0}), ℂ) Fn (ℤ≥‘𝑀)) |
18 | 1 | fneq2i 5014 | . . . 4 ⊢ (seq𝑀( + , (𝑍 × {0}), ℂ) Fn 𝑍 ↔ seq𝑀( + , (𝑍 × {0}), ℂ) Fn (ℤ≥‘𝑀)) |
19 | 17, 18 | sylibr 132 | . . 3 ⊢ (𝑀 ∈ ℤ → seq𝑀( + , (𝑍 × {0}), ℂ) Fn 𝑍) |
20 | 3 | fconst 5102 | . . . 4 ⊢ (𝑍 × {0}):𝑍⟶{0} |
21 | ffn 5066 | . . . 4 ⊢ ((𝑍 × {0}):𝑍⟶{0} → (𝑍 × {0}) Fn 𝑍) | |
22 | 20, 21 | ax-mp 7 | . . 3 ⊢ (𝑍 × {0}) Fn 𝑍 |
23 | eqfnfv 5286 | . . 3 ⊢ ((seq𝑀( + , (𝑍 × {0}), ℂ) Fn 𝑍 ∧ (𝑍 × {0}) Fn 𝑍) → (seq𝑀( + , (𝑍 × {0}), ℂ) = (𝑍 × {0}) ↔ ∀𝑘 ∈ 𝑍 (seq𝑀( + , (𝑍 × {0}), ℂ)‘𝑘) = ((𝑍 × {0})‘𝑘))) | |
24 | 19, 22, 23 | sylancl 404 | . 2 ⊢ (𝑀 ∈ ℤ → (seq𝑀( + , (𝑍 × {0}), ℂ) = (𝑍 × {0}) ↔ ∀𝑘 ∈ 𝑍 (seq𝑀( + , (𝑍 × {0}), ℂ)‘𝑘) = ((𝑍 × {0})‘𝑘))) |
25 | 6, 24 | mpbiri 166 | 1 ⊢ (𝑀 ∈ ℤ → seq𝑀( + , (𝑍 × {0}), ℂ) = (𝑍 × {0})) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 102 ↔ wb 103 = wceq 1284 ∈ wcel 1433 ∀wral 2348 Vcvv 2601 {csn 3398 × cxp 4361 Fn wfn 4917 ⟶wf 4918 ‘cfv 4922 (class class class)co 5532 ℂcc 6979 0cc0 6981 + caddc 6984 ℤcz 8351 ℤ≥cuz 8619 seqcseq 9431 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-13 1444 ax-14 1445 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-coll 3893 ax-sep 3896 ax-nul 3904 ax-pow 3948 ax-pr 3964 ax-un 4188 ax-setind 4280 ax-iinf 4329 ax-cnex 7067 ax-resscn 7068 ax-1cn 7069 ax-1re 7070 ax-icn 7071 ax-addcl 7072 ax-addrcl 7073 ax-mulcl 7074 ax-addcom 7076 ax-addass 7078 ax-distr 7080 ax-i2m1 7081 ax-0lt1 7082 ax-0id 7084 ax-rnegex 7085 ax-cnre 7087 ax-pre-ltirr 7088 ax-pre-ltwlin 7089 ax-pre-lttrn 7090 ax-pre-ltadd 7092 |
This theorem depends on definitions: df-bi 115 df-3or 920 df-3an 921 df-tru 1287 df-fal 1290 df-nf 1390 df-sb 1686 df-eu 1944 df-mo 1945 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-ne 2246 df-nel 2340 df-ral 2353 df-rex 2354 df-reu 2355 df-rab 2357 df-v 2603 df-sbc 2816 df-csb 2909 df-dif 2975 df-un 2977 df-in 2979 df-ss 2986 df-nul 3252 df-pw 3384 df-sn 3404 df-pr 3405 df-op 3407 df-uni 3602 df-int 3637 df-iun 3680 df-br 3786 df-opab 3840 df-mpt 3841 df-tr 3876 df-id 4048 df-iord 4121 df-on 4123 df-suc 4126 df-iom 4332 df-xp 4369 df-rel 4370 df-cnv 4371 df-co 4372 df-dm 4373 df-rn 4374 df-res 4375 df-ima 4376 df-iota 4887 df-fun 4924 df-fn 4925 df-f 4926 df-f1 4927 df-fo 4928 df-f1o 4929 df-fv 4930 df-riota 5488 df-ov 5535 df-oprab 5536 df-mpt2 5537 df-1st 5787 df-2nd 5788 df-recs 5943 df-frec 6001 df-pnf 7155 df-mnf 7156 df-xr 7157 df-ltxr 7158 df-le 7159 df-sub 7281 df-neg 7282 df-inn 8040 df-n0 8289 df-z 8352 df-uz 8620 df-fz 9030 df-fzo 9153 df-iseq 9432 |
This theorem is referenced by: iserclim0 10144 |
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