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。
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