The basic form of a parabolic equation, which is a type of partial differential equation, is written as ∂u / ∂t = c⊿u + f ( t , x )……(1) ( t >0,⊿= ∂2 /∂x12 + ……+ ∂2 / ∂xn2 ). Here, c is a positive constant and f is a known function. In physics, this equation describes the heat conduction or diffusion phenomenon of a substance, and the unknown function u =u ( t , x ) represents the temperature or concentration of the diffusing substance at time t and the point in space x =( x1 ,…… , xn ) . Usually, the problem is to find a solution to equation (1 ) that satisfies the initial condition, u (0, x )= u0 ( x )…… ( 2). Source: Heibonsha World Encyclopedia, 2nd Edition Information |
偏微分方程式の一つである放物型方程式の基本的な形は, ∂u/∂t=c⊿u+f(t,x) ……(1) (t>0,⊿=∂2/∂x12+……+∂2/∂xn2) と書かれる。ここでcは正の定数,fは既知関数である。物理的には熱伝導,または物質の拡散現象を記述する方程式で,未知関数u=u(t,x)は時刻t,空間の点x=(x1,……,xn)における温度,または拡散物質の濃度を表す。通常,方程式(1)の解で初期条件, u(0,x)=u0(x) ……(2) を満たすものを求めることが問題になる。
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 |
...A type of frog that secretes a strong poison f...
A general term for frogs of the Hylidae family, in...
American film. Directed by Charles Chaplin. Produ...
…[Masaaki Kunishige]. … *Some of the terminology ...
It is defined as "the birth of a child betwe...
…It was established in 1931 as an organization fo...
It is believed that this was the first criminal co...
…Under the Japanese inheritance system, where the...
…Together with Ina Tadatsugu and others, he becam...
A Western painting group in the Taisho period. It...
...There are many delicious home-cooked dishes, s...
...In Eastern Europe, the Solidarity movement als...
…the term refers to the catalog of books that the...
One of the fundamental human rights guaranteed in...
…the symbol for the element is derived from these...