Let C r be the set of functions that are continuously differentiable r times in the interval ( a , b ). For the differential operator acting on function u ∈ C r , let p k ∈ C k ( k = 0,1,..., r ). On the other hand, if we consider the differential operator acting on v ∈ C r , if u , v ∈ C r and at least one of u and v is identically 0 near a and b , then by integration by parts we obtain: A differential operator D ' that satisfies this relationship is called the adjoint differential operator of D. In this case, we can also see that ( D ')' = D by integration by parts. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
区間(a,b)においてr回連続微分可能な関数の全体をCrと書く。関数u∈Crに作用する微分作用素,においてpk∈Ck(k=0,1,……,r)とする。これに対して,v∈Crに作用する微分作用素,を考えると,u,v∈Crであってa,bの近くではu,vの少なくとも一方が恒等的に0となるならば,部分積分により,が成立する。このような関係にある微分作用素D′をDの随伴微分作用素という。このとき(D′)′=Dであることも部分積分によってわかる。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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