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フィボナッチ数のとある恒等式
(恒等式の作り方)
発表者 : まこぴ~
2017年6月
自己紹介
名前 : まこぴ~
出身 : 某大学大学院
修了 : 昭和61年
専門分野 : わかりません^^
特徴 : 数学と名の付くところには、首を
突っ込みたくなる。
他には : コミケで Project M という
サークルを主宰している。
コミケにおけるサークルカット
C91(2016年12月)
今回の発表の動機
フィボナッチ数(数列)に関するコミケ本を執筆
中に漠然とイメージした数式が、
面白いものではないかと思い立ち、
皆さんと共有したいと思い立つ。
フィボナッチ数・リュカ数の定義
ビネの公式(明示式)
行列表現
個人の名前を冠した等式
Cassini's identity
Catalan's identity
ここから、数式の話に入ります。
どんな式かな?
こじつけます。1番目と2番目は係数が同じである。
更にこじつけます。2番目と3番目は右辺が同じである。
結果、次のように予想します。
の検証
n 1 2 3 4 5 6 7 8 9 10
F_n 1 1 2 3 5 8 13 21 34 55
m L_m
1 1 -1 1 -1 1 -1 1 -1 1 -1
2 3 -1 1 -1 1 -1 1 -1 1
3 4 -4 4 -4 4 -4 4 -4
4 7 -9 9 -9 9 -9 9
左辺をエクセルで計算してみた。
ん?なんか変! 符号がおかしい
勿論、厳密な証明はできますが、
複雑なので省略します。
以上、恒等式の作り方でした。

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フィボナッチ数のとある恒等式