When there is a sequence of numbers or a sequence of functions S i ( i = 1, 2, 3, ..., n , ...), this refers to the formula that expresses S n +1 using some of the S i ( i ≦ n ). For example, in an arithmetic sequence with a common difference of a , S n +1 = S n + a , and in a geometric sequence with a common ratio of r , S n +1 = rS n . In addition, integrals So I n ={- sin n -1 x・cos x +( n -1) I n -2 }/ n This is also a kind of differential equation. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
数列または関数列 Si(i=1,2,3,…,n,…) があるとき,Si(i≦n) のいくつかを用いて,Sn+1 を表わす公式のことをいう。たとえば,公差が a の等差数列では Sn+1=Sn+a ,また公比が r の等比数列では Sn+1=rSn ,また,積分 では In={- sin n-1x・ cos x+(n-1)In-2}/n などの漸化式が与えられる。一種の差分方程式でもある。 出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報 |
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