Asymptotic Behavior of Zeros of Solutions for Parabolic Equations

Asymptotic Behavior of Zeros of Solutions for Parabolic Equations
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抛物方程解的零点的渐近行为

DOI:
10.1006/jdeq.2000.3819
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发表时间:
2001
影响因子:
2.4
通讯作者:
N. Mizoguchi
N. Mizoguchi
中科院分区:
数学2区
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作者:
N. Mizoguchi

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设p >1,α ∈ 0,且α ∈ L ∞(R)<$L1(R)变号有限次.本文讨论了一个柯西问题[公式]:定义解u的零点集Z(t)={ x ∈ R:u(x,t)=0},其中t >0.在α =0的情况下,我们证明了对于大的t >0且某些C >0,集合Z(t)包含在[-Ct,Ct ]中,并且t的这种阶是最好的可能。当α >0时,我们也给出了整体解的Z(t)的估计,并证明了Z(t)<$[− K,K ]对所有t ∈(0,T),且每个爆破解都有K >0,其中T是爆破时间.
Abstract Let p >1, α ⩾0, and ϕ ∈ L ∞ ( R )∩ L 1 ( R ) change its sign finite times. This paper is concerned with a Cauchy problem [formula] Define the set of zeros of a solution u by Z ( t )={ x ∈ R  :  u ( x ,  t )=0} for t >0. In the case of α =0, we show that the set Z ( t ) is contained in [− Ct ,  Ct ] for large t >0 with some C >0 and that this order of t is best possible. When α >0, we also give estimates of Z ( t ) for global solutions and prove that Z ( t )⊂[− K ,  K ] for all t ∈(0,  T ) with some K >0 for each blowup solution, where T is the blowup time.
N.Mizoguchi:“半线性抛物线方程中符号变化的解爆炸的关键指数,II”J.Differential Equations。
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