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Mirrors > Home > MPE Home > Th. List > risefallfac | Structured version Visualization version GIF version |
Description: A relationship between rising and falling factorials. (Contributed by Scott Fenton, 15-Jan-2018.) |
Ref | Expression |
---|---|
risefallfac | ⊢ ((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) → (𝑋 RiseFac 𝑁) = ((-1↑𝑁) · (-𝑋 FallFac 𝑁))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | negcl 11151 | . . . . . . 7 ⊢ (𝑋 ∈ ℂ → -𝑋 ∈ ℂ) | |
2 | 1 | adantr 480 | . . . . . 6 ⊢ ((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) → -𝑋 ∈ ℂ) |
3 | elfznn 13214 | . . . . . . . 8 ⊢ (𝑘 ∈ (1...𝑁) → 𝑘 ∈ ℕ) | |
4 | nnm1nn0 12204 | . . . . . . . 8 ⊢ (𝑘 ∈ ℕ → (𝑘 − 1) ∈ ℕ0) | |
5 | 3, 4 | syl 17 | . . . . . . 7 ⊢ (𝑘 ∈ (1...𝑁) → (𝑘 − 1) ∈ ℕ0) |
6 | 5 | nn0cnd 12225 | . . . . . 6 ⊢ (𝑘 ∈ (1...𝑁) → (𝑘 − 1) ∈ ℂ) |
7 | subcl 11150 | . . . . . 6 ⊢ ((-𝑋 ∈ ℂ ∧ (𝑘 − 1) ∈ ℂ) → (-𝑋 − (𝑘 − 1)) ∈ ℂ) | |
8 | 2, 6, 7 | syl2an 595 | . . . . 5 ⊢ (((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) ∧ 𝑘 ∈ (1...𝑁)) → (-𝑋 − (𝑘 − 1)) ∈ ℂ) |
9 | 8 | mulm1d 11357 | . . . 4 ⊢ (((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) ∧ 𝑘 ∈ (1...𝑁)) → (-1 · (-𝑋 − (𝑘 − 1))) = -(-𝑋 − (𝑘 − 1))) |
10 | simpll 763 | . . . . . 6 ⊢ (((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) ∧ 𝑘 ∈ (1...𝑁)) → 𝑋 ∈ ℂ) | |
11 | 6 | adantl 481 | . . . . . 6 ⊢ (((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) ∧ 𝑘 ∈ (1...𝑁)) → (𝑘 − 1) ∈ ℂ) |
12 | 10, 11 | negdi2d 11276 | . . . . 5 ⊢ (((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) ∧ 𝑘 ∈ (1...𝑁)) → -(𝑋 + (𝑘 − 1)) = (-𝑋 − (𝑘 − 1))) |
13 | 12 | negeqd 11145 | . . . 4 ⊢ (((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) ∧ 𝑘 ∈ (1...𝑁)) → --(𝑋 + (𝑘 − 1)) = -(-𝑋 − (𝑘 − 1))) |
14 | simpl 482 | . . . . . 6 ⊢ ((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) → 𝑋 ∈ ℂ) | |
15 | addcl 10884 | . . . . . 6 ⊢ ((𝑋 ∈ ℂ ∧ (𝑘 − 1) ∈ ℂ) → (𝑋 + (𝑘 − 1)) ∈ ℂ) | |
16 | 14, 6, 15 | syl2an 595 | . . . . 5 ⊢ (((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) ∧ 𝑘 ∈ (1...𝑁)) → (𝑋 + (𝑘 − 1)) ∈ ℂ) |
17 | 16 | negnegd 11253 | . . . 4 ⊢ (((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) ∧ 𝑘 ∈ (1...𝑁)) → --(𝑋 + (𝑘 − 1)) = (𝑋 + (𝑘 − 1))) |
18 | 9, 13, 17 | 3eqtr2rd 2785 | . . 3 ⊢ (((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) ∧ 𝑘 ∈ (1...𝑁)) → (𝑋 + (𝑘 − 1)) = (-1 · (-𝑋 − (𝑘 − 1)))) |
19 | 18 | prodeq2dv 15561 | . 2 ⊢ ((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) → ∏𝑘 ∈ (1...𝑁)(𝑋 + (𝑘 − 1)) = ∏𝑘 ∈ (1...𝑁)(-1 · (-𝑋 − (𝑘 − 1)))) |
20 | risefacval2 15648 | . 2 ⊢ ((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) → (𝑋 RiseFac 𝑁) = ∏𝑘 ∈ (1...𝑁)(𝑋 + (𝑘 − 1))) | |
21 | fzfi 13620 | . . . . . . 7 ⊢ (1...𝑁) ∈ Fin | |
22 | neg1cn 12017 | . . . . . . 7 ⊢ -1 ∈ ℂ | |
23 | fprodconst 15616 | . . . . . . 7 ⊢ (((1...𝑁) ∈ Fin ∧ -1 ∈ ℂ) → ∏𝑘 ∈ (1...𝑁)-1 = (-1↑(♯‘(1...𝑁)))) | |
24 | 21, 22, 23 | mp2an 688 | . . . . . 6 ⊢ ∏𝑘 ∈ (1...𝑁)-1 = (-1↑(♯‘(1...𝑁))) |
25 | hashfz1 13988 | . . . . . . 7 ⊢ (𝑁 ∈ ℕ0 → (♯‘(1...𝑁)) = 𝑁) | |
26 | 25 | oveq2d 7271 | . . . . . 6 ⊢ (𝑁 ∈ ℕ0 → (-1↑(♯‘(1...𝑁))) = (-1↑𝑁)) |
27 | 24, 26 | eqtr2id 2792 | . . . . 5 ⊢ (𝑁 ∈ ℕ0 → (-1↑𝑁) = ∏𝑘 ∈ (1...𝑁)-1) |
28 | 27 | adantl 481 | . . . 4 ⊢ ((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) → (-1↑𝑁) = ∏𝑘 ∈ (1...𝑁)-1) |
29 | fallfacval2 15649 | . . . . 5 ⊢ ((-𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) → (-𝑋 FallFac 𝑁) = ∏𝑘 ∈ (1...𝑁)(-𝑋 − (𝑘 − 1))) | |
30 | 1, 29 | sylan 579 | . . . 4 ⊢ ((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) → (-𝑋 FallFac 𝑁) = ∏𝑘 ∈ (1...𝑁)(-𝑋 − (𝑘 − 1))) |
31 | 28, 30 | oveq12d 7273 | . . 3 ⊢ ((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) → ((-1↑𝑁) · (-𝑋 FallFac 𝑁)) = (∏𝑘 ∈ (1...𝑁)-1 · ∏𝑘 ∈ (1...𝑁)(-𝑋 − (𝑘 − 1)))) |
32 | fzfid 13621 | . . . 4 ⊢ ((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) → (1...𝑁) ∈ Fin) | |
33 | 22 | a1i 11 | . . . 4 ⊢ (((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) ∧ 𝑘 ∈ (1...𝑁)) → -1 ∈ ℂ) |
34 | 32, 33, 8 | fprodmul 15598 | . . 3 ⊢ ((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) → ∏𝑘 ∈ (1...𝑁)(-1 · (-𝑋 − (𝑘 − 1))) = (∏𝑘 ∈ (1...𝑁)-1 · ∏𝑘 ∈ (1...𝑁)(-𝑋 − (𝑘 − 1)))) |
35 | 31, 34 | eqtr4d 2781 | . 2 ⊢ ((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) → ((-1↑𝑁) · (-𝑋 FallFac 𝑁)) = ∏𝑘 ∈ (1...𝑁)(-1 · (-𝑋 − (𝑘 − 1)))) |
36 | 19, 20, 35 | 3eqtr4d 2788 | 1 ⊢ ((𝑋 ∈ ℂ ∧ 𝑁 ∈ ℕ0) → (𝑋 RiseFac 𝑁) = ((-1↑𝑁) · (-𝑋 FallFac 𝑁))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 = wceq 1539 ∈ wcel 2108 ‘cfv 6418 (class class class)co 7255 Fincfn 8691 ℂcc 10800 1c1 10803 + caddc 10805 · cmul 10807 − cmin 11135 -cneg 11136 ℕcn 11903 ℕ0cn0 12163 ...cfz 13168 ↑cexp 13710 ♯chash 13972 ∏cprod 15543 FallFac cfallfac 15642 RiseFac crisefac 15643 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-rep 5205 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-inf2 9329 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 ax-pre-sup 10880 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rmo 3071 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-int 4877 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-se 5536 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-isom 6427 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-om 7688 df-1st 7804 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-1o 8267 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-fin 8695 df-sup 9131 df-oi 9199 df-card 9628 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-div 11563 df-nn 11904 df-2 11966 df-3 11967 df-n0 12164 df-z 12250 df-uz 12512 df-rp 12660 df-fz 13169 df-fzo 13312 df-seq 13650 df-exp 13711 df-hash 13973 df-cj 14738 df-re 14739 df-im 14740 df-sqrt 14874 df-abs 14875 df-clim 15125 df-prod 15544 df-risefac 15644 df-fallfac 15645 |
This theorem is referenced by: fallrisefac 15663 0risefac 15676 binomrisefac 15680 |
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