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Mirrors > Home > ILE Home > Th. List > fisumrev2 | GIF version |
Description: Reversal of a finite sum. (Contributed by NM, 27-Nov-2005.) (Revised by Mario Carneiro, 13-Apr-2016.) |
Ref | Expression |
---|---|
fisumrev2.m | ⊢ (𝜑 → 𝑀 ∈ ℤ) |
fisumrev2.n | ⊢ (𝜑 → 𝑁 ∈ ℤ) |
fsumrev2.1 | ⊢ ((𝜑 ∧ 𝑗 ∈ (𝑀...𝑁)) → 𝐴 ∈ ℂ) |
fsumrev2.2 | ⊢ (𝑗 = ((𝑀 + 𝑁) − 𝑘) → 𝐴 = 𝐵) |
Ref | Expression |
---|---|
fisumrev2 | ⊢ (𝜑 → Σ𝑗 ∈ (𝑀...𝑁)𝐴 = Σ𝑘 ∈ (𝑀...𝑁)𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fisumrev2.m | . . . . 5 ⊢ (𝜑 → 𝑀 ∈ ℤ) | |
2 | 1 | adantr 274 | . . . 4 ⊢ ((𝜑 ∧ 𝑀 ≤ 𝑁) → 𝑀 ∈ ℤ) |
3 | fisumrev2.n | . . . . 5 ⊢ (𝜑 → 𝑁 ∈ ℤ) | |
4 | 3 | adantr 274 | . . . 4 ⊢ ((𝜑 ∧ 𝑀 ≤ 𝑁) → 𝑁 ∈ ℤ) |
5 | simpr 109 | . . . 4 ⊢ ((𝜑 ∧ 𝑀 ≤ 𝑁) → 𝑀 ≤ 𝑁) | |
6 | eluz2 9472 | . . . 4 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) ↔ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑀 ≤ 𝑁)) | |
7 | 2, 4, 5, 6 | syl3anbrc 1171 | . . 3 ⊢ ((𝜑 ∧ 𝑀 ≤ 𝑁) → 𝑁 ∈ (ℤ≥‘𝑀)) |
8 | 1 | adantr 274 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → 𝑀 ∈ ℤ) |
9 | 3 | adantr 274 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → 𝑁 ∈ ℤ) |
10 | 8, 9 | zaddcld 9317 | . . . . 5 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → (𝑀 + 𝑁) ∈ ℤ) |
11 | fsumrev2.1 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑗 ∈ (𝑀...𝑁)) → 𝐴 ∈ ℂ) | |
12 | 11 | adantlr 469 | . . . . 5 ⊢ (((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) ∧ 𝑗 ∈ (𝑀...𝑁)) → 𝐴 ∈ ℂ) |
13 | fsumrev2.2 | . . . . 5 ⊢ (𝑗 = ((𝑀 + 𝑁) − 𝑘) → 𝐴 = 𝐵) | |
14 | 10, 8, 9, 12, 13 | fsumrev 11384 | . . . 4 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → Σ𝑗 ∈ (𝑀...𝑁)𝐴 = Σ𝑘 ∈ (((𝑀 + 𝑁) − 𝑁)...((𝑀 + 𝑁) − 𝑀))𝐵) |
15 | 8 | zcnd 9314 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → 𝑀 ∈ ℂ) |
16 | 9 | zcnd 9314 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → 𝑁 ∈ ℂ) |
17 | 15, 16 | pncand 8210 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → ((𝑀 + 𝑁) − 𝑁) = 𝑀) |
18 | 15, 16 | pncan2d 8211 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → ((𝑀 + 𝑁) − 𝑀) = 𝑁) |
19 | 17, 18 | oveq12d 5860 | . . . . 5 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → (((𝑀 + 𝑁) − 𝑁)...((𝑀 + 𝑁) − 𝑀)) = (𝑀...𝑁)) |
20 | 19 | sumeq1d 11307 | . . . 4 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → Σ𝑘 ∈ (((𝑀 + 𝑁) − 𝑁)...((𝑀 + 𝑁) − 𝑀))𝐵 = Σ𝑘 ∈ (𝑀...𝑁)𝐵) |
21 | 14, 20 | eqtrd 2198 | . . 3 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → Σ𝑗 ∈ (𝑀...𝑁)𝐴 = Σ𝑘 ∈ (𝑀...𝑁)𝐵) |
22 | 7, 21 | syldan 280 | . 2 ⊢ ((𝜑 ∧ 𝑀 ≤ 𝑁) → Σ𝑗 ∈ (𝑀...𝑁)𝐴 = Σ𝑘 ∈ (𝑀...𝑁)𝐵) |
23 | fzn 9977 | . . . . 5 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑁 < 𝑀 ↔ (𝑀...𝑁) = ∅)) | |
24 | 1, 3, 23 | syl2anc 409 | . . . 4 ⊢ (𝜑 → (𝑁 < 𝑀 ↔ (𝑀...𝑁) = ∅)) |
25 | 24 | biimpa 294 | . . 3 ⊢ ((𝜑 ∧ 𝑁 < 𝑀) → (𝑀...𝑁) = ∅) |
26 | sum0 11329 | . . . . 5 ⊢ Σ𝑗 ∈ ∅ 𝐴 = 0 | |
27 | sum0 11329 | . . . . 5 ⊢ Σ𝑘 ∈ ∅ 𝐵 = 0 | |
28 | 26, 27 | eqtr4i 2189 | . . . 4 ⊢ Σ𝑗 ∈ ∅ 𝐴 = Σ𝑘 ∈ ∅ 𝐵 |
29 | sumeq1 11296 | . . . 4 ⊢ ((𝑀...𝑁) = ∅ → Σ𝑗 ∈ (𝑀...𝑁)𝐴 = Σ𝑗 ∈ ∅ 𝐴) | |
30 | sumeq1 11296 | . . . 4 ⊢ ((𝑀...𝑁) = ∅ → Σ𝑘 ∈ (𝑀...𝑁)𝐵 = Σ𝑘 ∈ ∅ 𝐵) | |
31 | 28, 29, 30 | 3eqtr4a 2225 | . . 3 ⊢ ((𝑀...𝑁) = ∅ → Σ𝑗 ∈ (𝑀...𝑁)𝐴 = Σ𝑘 ∈ (𝑀...𝑁)𝐵) |
32 | 25, 31 | syl 14 | . 2 ⊢ ((𝜑 ∧ 𝑁 < 𝑀) → Σ𝑗 ∈ (𝑀...𝑁)𝐴 = Σ𝑘 ∈ (𝑀...𝑁)𝐵) |
33 | zlelttric 9236 | . . 3 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 ≤ 𝑁 ∨ 𝑁 < 𝑀)) | |
34 | 1, 3, 33 | syl2anc 409 | . 2 ⊢ (𝜑 → (𝑀 ≤ 𝑁 ∨ 𝑁 < 𝑀)) |
35 | 22, 32, 34 | mpjaodan 788 | 1 ⊢ (𝜑 → Σ𝑗 ∈ (𝑀...𝑁)𝐴 = Σ𝑘 ∈ (𝑀...𝑁)𝐵) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ↔ wb 104 ∨ wo 698 = wceq 1343 ∈ wcel 2136 ∅c0 3409 class class class wbr 3982 ‘cfv 5188 (class class class)co 5842 ℂcc 7751 0cc0 7753 + caddc 7756 < clt 7933 ≤ cle 7934 − cmin 8069 ℤcz 9191 ℤ≥cuz 9466 ...cfz 9944 Σcsu 11294 |
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 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-13 2138 ax-14 2139 ax-ext 2147 ax-coll 4097 ax-sep 4100 ax-nul 4108 ax-pow 4153 ax-pr 4187 ax-un 4411 ax-setind 4514 ax-iinf 4565 ax-cnex 7844 ax-resscn 7845 ax-1cn 7846 ax-1re 7847 ax-icn 7848 ax-addcl 7849 ax-addrcl 7850 ax-mulcl 7851 ax-mulrcl 7852 ax-addcom 7853 ax-mulcom 7854 ax-addass 7855 ax-mulass 7856 ax-distr 7857 ax-i2m1 7858 ax-0lt1 7859 ax-1rid 7860 ax-0id 7861 ax-rnegex 7862 ax-precex 7863 ax-cnre 7864 ax-pre-ltirr 7865 ax-pre-ltwlin 7866 ax-pre-lttrn 7867 ax-pre-apti 7868 ax-pre-ltadd 7869 ax-pre-mulgt0 7870 ax-pre-mulext 7871 ax-arch 7872 ax-caucvg 7873 |
This theorem depends on definitions: df-bi 116 df-dc 825 df-3or 969 df-3an 970 df-tru 1346 df-fal 1349 df-nf 1449 df-sb 1751 df-eu 2017 df-mo 2018 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-ne 2337 df-nel 2432 df-ral 2449 df-rex 2450 df-reu 2451 df-rmo 2452 df-rab 2453 df-v 2728 df-sbc 2952 df-csb 3046 df-dif 3118 df-un 3120 df-in 3122 df-ss 3129 df-nul 3410 df-if 3521 df-pw 3561 df-sn 3582 df-pr 3583 df-op 3585 df-uni 3790 df-int 3825 df-iun 3868 df-br 3983 df-opab 4044 df-mpt 4045 df-tr 4081 df-id 4271 df-po 4274 df-iso 4275 df-iord 4344 df-on 4346 df-ilim 4347 df-suc 4349 df-iom 4568 df-xp 4610 df-rel 4611 df-cnv 4612 df-co 4613 df-dm 4614 df-rn 4615 df-res 4616 df-ima 4617 df-iota 5153 df-fun 5190 df-fn 5191 df-f 5192 df-f1 5193 df-fo 5194 df-f1o 5195 df-fv 5196 df-isom 5197 df-riota 5798 df-ov 5845 df-oprab 5846 df-mpo 5847 df-1st 6108 df-2nd 6109 df-recs 6273 df-irdg 6338 df-frec 6359 df-1o 6384 df-oadd 6388 df-er 6501 df-en 6707 df-dom 6708 df-fin 6709 df-pnf 7935 df-mnf 7936 df-xr 7937 df-ltxr 7938 df-le 7939 df-sub 8071 df-neg 8072 df-reap 8473 df-ap 8480 df-div 8569 df-inn 8858 df-2 8916 df-3 8917 df-4 8918 df-n0 9115 df-z 9192 df-uz 9467 df-q 9558 df-rp 9590 df-fz 9945 df-fzo 10078 df-seqfrec 10381 df-exp 10455 df-ihash 10689 df-cj 10784 df-re 10785 df-im 10786 df-rsqrt 10940 df-abs 10941 df-clim 11220 df-sumdc 11295 |
This theorem is referenced by: fisum0diag2 11388 efaddlem 11615 |
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