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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 271 | . . . 4 ⊢ ((𝜑 ∧ 𝑀 ≤ 𝑁) → 𝑀 ∈ ℤ) |
3 | fisumrev2.n | . . . . 5 ⊢ (𝜑 → 𝑁 ∈ ℤ) | |
4 | 3 | adantr 271 | . . . 4 ⊢ ((𝜑 ∧ 𝑀 ≤ 𝑁) → 𝑁 ∈ ℤ) |
5 | simpr 109 | . . . 4 ⊢ ((𝜑 ∧ 𝑀 ≤ 𝑁) → 𝑀 ≤ 𝑁) | |
6 | eluz2 9124 | . . . 4 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) ↔ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑀 ≤ 𝑁)) | |
7 | 2, 4, 5, 6 | syl3anbrc 1130 | . . 3 ⊢ ((𝜑 ∧ 𝑀 ≤ 𝑁) → 𝑁 ∈ (ℤ≥‘𝑀)) |
8 | 1 | adantr 271 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → 𝑀 ∈ ℤ) |
9 | 3 | adantr 271 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → 𝑁 ∈ ℤ) |
10 | 8, 9 | zaddcld 8971 | . . . . 5 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → (𝑀 + 𝑁) ∈ ℤ) |
11 | fsumrev2.1 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑗 ∈ (𝑀...𝑁)) → 𝐴 ∈ ℂ) | |
12 | 11 | adantlr 462 | . . . . 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 11001 | . . . 4 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → Σ𝑗 ∈ (𝑀...𝑁)𝐴 = Σ𝑘 ∈ (((𝑀 + 𝑁) − 𝑁)...((𝑀 + 𝑁) − 𝑀))𝐵) |
15 | 8 | zcnd 8968 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → 𝑀 ∈ ℂ) |
16 | 9 | zcnd 8968 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → 𝑁 ∈ ℂ) |
17 | 15, 16 | pncand 7891 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → ((𝑀 + 𝑁) − 𝑁) = 𝑀) |
18 | 15, 16 | pncan2d 7892 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → ((𝑀 + 𝑁) − 𝑀) = 𝑁) |
19 | 17, 18 | oveq12d 5708 | . . . . 5 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → (((𝑀 + 𝑁) − 𝑁)...((𝑀 + 𝑁) − 𝑀)) = (𝑀...𝑁)) |
20 | 19 | sumeq1d 10924 | . . . 4 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → Σ𝑘 ∈ (((𝑀 + 𝑁) − 𝑁)...((𝑀 + 𝑁) − 𝑀))𝐵 = Σ𝑘 ∈ (𝑀...𝑁)𝐵) |
21 | 14, 20 | eqtrd 2127 | . . 3 ⊢ ((𝜑 ∧ 𝑁 ∈ (ℤ≥‘𝑀)) → Σ𝑗 ∈ (𝑀...𝑁)𝐴 = Σ𝑘 ∈ (𝑀...𝑁)𝐵) |
22 | 7, 21 | syldan 277 | . 2 ⊢ ((𝜑 ∧ 𝑀 ≤ 𝑁) → Σ𝑗 ∈ (𝑀...𝑁)𝐴 = Σ𝑘 ∈ (𝑀...𝑁)𝐵) |
23 | fzn 9605 | . . . . 5 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑁 < 𝑀 ↔ (𝑀...𝑁) = ∅)) | |
24 | 1, 3, 23 | syl2anc 404 | . . . 4 ⊢ (𝜑 → (𝑁 < 𝑀 ↔ (𝑀...𝑁) = ∅)) |
25 | 24 | biimpa 291 | . . 3 ⊢ ((𝜑 ∧ 𝑁 < 𝑀) → (𝑀...𝑁) = ∅) |
26 | sum0 10946 | . . . . 5 ⊢ Σ𝑗 ∈ ∅ 𝐴 = 0 | |
27 | sum0 10946 | . . . . 5 ⊢ Σ𝑘 ∈ ∅ 𝐵 = 0 | |
28 | 26, 27 | eqtr4i 2118 | . . . 4 ⊢ Σ𝑗 ∈ ∅ 𝐴 = Σ𝑘 ∈ ∅ 𝐵 |
29 | sumeq1 10913 | . . . 4 ⊢ ((𝑀...𝑁) = ∅ → Σ𝑗 ∈ (𝑀...𝑁)𝐴 = Σ𝑗 ∈ ∅ 𝐴) | |
30 | sumeq1 10913 | . . . 4 ⊢ ((𝑀...𝑁) = ∅ → Σ𝑘 ∈ (𝑀...𝑁)𝐵 = Σ𝑘 ∈ ∅ 𝐵) | |
31 | 28, 29, 30 | 3eqtr4a 2153 | . . 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 8893 | . . 3 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 ≤ 𝑁 ∨ 𝑁 < 𝑀)) | |
34 | 1, 3, 33 | syl2anc 404 | . 2 ⊢ (𝜑 → (𝑀 ≤ 𝑁 ∨ 𝑁 < 𝑀)) |
35 | 22, 32, 34 | mpjaodan 750 | 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 667 = wceq 1296 ∈ wcel 1445 ∅c0 3302 class class class wbr 3867 ‘cfv 5049 (class class class)co 5690 ℂcc 7445 0cc0 7447 + caddc 7450 < clt 7619 ≤ cle 7620 − cmin 7750 ℤcz 8848 ℤ≥cuz 9118 ...cfz 9573 Σcsu 10911 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 582 ax-in2 583 ax-io 668 ax-5 1388 ax-7 1389 ax-gen 1390 ax-ie1 1434 ax-ie2 1435 ax-8 1447 ax-10 1448 ax-11 1449 ax-i12 1450 ax-bndl 1451 ax-4 1452 ax-13 1456 ax-14 1457 ax-17 1471 ax-i9 1475 ax-ial 1479 ax-i5r 1480 ax-ext 2077 ax-coll 3975 ax-sep 3978 ax-nul 3986 ax-pow 4030 ax-pr 4060 ax-un 4284 ax-setind 4381 ax-iinf 4431 ax-cnex 7533 ax-resscn 7534 ax-1cn 7535 ax-1re 7536 ax-icn 7537 ax-addcl 7538 ax-addrcl 7539 ax-mulcl 7540 ax-mulrcl 7541 ax-addcom 7542 ax-mulcom 7543 ax-addass 7544 ax-mulass 7545 ax-distr 7546 ax-i2m1 7547 ax-0lt1 7548 ax-1rid 7549 ax-0id 7550 ax-rnegex 7551 ax-precex 7552 ax-cnre 7553 ax-pre-ltirr 7554 ax-pre-ltwlin 7555 ax-pre-lttrn 7556 ax-pre-apti 7557 ax-pre-ltadd 7558 ax-pre-mulgt0 7559 ax-pre-mulext 7560 ax-arch 7561 ax-caucvg 7562 |
This theorem depends on definitions: df-bi 116 df-dc 784 df-3or 928 df-3an 929 df-tru 1299 df-fal 1302 df-nf 1402 df-sb 1700 df-eu 1958 df-mo 1959 df-clab 2082 df-cleq 2088 df-clel 2091 df-nfc 2224 df-ne 2263 df-nel 2358 df-ral 2375 df-rex 2376 df-reu 2377 df-rmo 2378 df-rab 2379 df-v 2635 df-sbc 2855 df-csb 2948 df-dif 3015 df-un 3017 df-in 3019 df-ss 3026 df-nul 3303 df-if 3414 df-pw 3451 df-sn 3472 df-pr 3473 df-op 3475 df-uni 3676 df-int 3711 df-iun 3754 df-br 3868 df-opab 3922 df-mpt 3923 df-tr 3959 df-id 4144 df-po 4147 df-iso 4148 df-iord 4217 df-on 4219 df-ilim 4220 df-suc 4222 df-iom 4434 df-xp 4473 df-rel 4474 df-cnv 4475 df-co 4476 df-dm 4477 df-rn 4478 df-res 4479 df-ima 4480 df-iota 5014 df-fun 5051 df-fn 5052 df-f 5053 df-f1 5054 df-fo 5055 df-f1o 5056 df-fv 5057 df-isom 5058 df-riota 5646 df-ov 5693 df-oprab 5694 df-mpt2 5695 df-1st 5949 df-2nd 5950 df-recs 6108 df-irdg 6173 df-frec 6194 df-1o 6219 df-oadd 6223 df-er 6332 df-en 6538 df-dom 6539 df-fin 6540 df-pnf 7621 df-mnf 7622 df-xr 7623 df-ltxr 7624 df-le 7625 df-sub 7752 df-neg 7753 df-reap 8149 df-ap 8156 df-div 8237 df-inn 8521 df-2 8579 df-3 8580 df-4 8581 df-n0 8772 df-z 8849 df-uz 9119 df-q 9204 df-rp 9234 df-fz 9574 df-fzo 9703 df-iseq 10002 df-seq3 10003 df-exp 10086 df-ihash 10315 df-cj 10407 df-re 10408 df-im 10409 df-rsqrt 10562 df-abs 10563 df-clim 10838 df-sumdc 10912 |
This theorem is referenced by: fisum0diag2 11005 efaddlem 11128 |
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