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研究生: 涂瑋辰
TU, WEI -CHEN.
論文名稱: 拋物型方程柯西問題解的爆破行為
Blowup Behavior for Parabolic Cauchy Problem
指導教授: 蔡東和
Tsai, Dong-Ho
口試委員: 江金城
Jiang, Jin-Cheng
念家興
Nien, Chia-Hsing
學位類別: 碩士
Master
系所名稱: 理學院 - 數學系
Department of Mathematics
論文出版年: 2018
畢業學年度: 106
語文別: 英文
論文頁數: 42
中文關鍵詞: 拋物型方程爆破行為
外文關鍵詞: Blowup Behavior, Parabolic Cauchy Problem
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  • 摘要

    這篇論文我們研究滿足以下方程初始值問題的非負函數 u(t,x)≥0:
    ( u_t=∆u+u^(1+α) ,x∈R^m,t>0 and u(x,0)=a(x),x∈R^m )

    這裡α>0而且a(x)≥0 (a(x)非零函數) 我們有以下兩個結果: 當
    0<mα<2 時,不存在時間延拓到無窮大的解。當mα>2 時,存在一些初
    始值a(x)使的有時間延拓到無窮大的解。


    Abstract
    In this paper, we study the ivp(initial value problem) for a nonnegative function u(t,x)≥0 :
    ( u_t=∆u+u^(1+α) ,x∈R^m,t>0 and u(x,0)=a(x),x∈R^m )
    where α> 0 is a constant and the initial date a(x)>0 is given(a(x) is not identically zero ). We prove the following two results : if 0 <m α< 2, there
    is no global solution of the ivp defined for all time t∈[0;∞) ; on the other hand, if m α>2, there exists initial data a(x) so that the ivp has a global solution defined for all time t∈[0;∞)

    Contents 1 Introduction 1 2 The …rst theorem 3 2.1 Side issues . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Proof of the …rst theorem . . . . . . . . . . . . . . . . . 5 3 The second theorem 23 3.1 Proof of the second theorem . . . . . . . . . . . . . . . .23 3.2 Solving an untegral equation . . . . . . . . . . . . . . . .30 4 Reference 38

    [1] Fujita, H.: On the blowing up of solutions of the Cauchy problem for
    u_t=∆u+u^(1+α) . J. Fac. Sci. Univ. Tokyo Sect. I, 13, 109-124 (1966).
    [2] Evans,L.C. - Partial differential equations, Graduate Studies in
    Mathematics , volume 19 , AMS. Providence , Rhode Island(1998).

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