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具強吸收項的擬線性拋物方程解的緊支集和熄滅

2025-02-06 00:00:00李亞楠王春朋
吉林大學學報(理學版) 2025年1期

摘要: 考慮一類具強吸收項的擬線性拋物方程Cauchy問題, 由于強吸收項的作用, 該問題的解可以在有限時刻具有緊支集和發生熄滅. 首先, 利用比較原理, 通過構造合適的上解證明

該問題的解在某個時刻后具有一致的緊支集, 甚至還可以在任意正時刻后都具有一致的緊支集. 其次, 在一定條件下, 利用該問題的解在不同時刻的L1范數估計, 證明其在有限時刻發生熄滅.

關鍵詞: 擬線性拋物方程; 強吸收項; 緊支集; 熄滅

中圖分類號: O175.29 "文獻標志碼: A "文章編號: 1671-5489(2025)01-0001-08

Compact Supports and Extinction of Solutions to QuasilinearParabolic Equations with Strong Absorption Terms

LI Yanan, WANG Chunpeng

(College of Mathematics, Jilin University, Changchun 130012, China)

Abstract: We considered" the Cauchy problem of a class of quasilinear parabolic equations with strong absorption terms. Due to the effect of the strong absorption term,

the solution to the problem could" possess compact support and extinguish" at a finite time. Firstly, by using" the comparison principle and constructing suitable supersolutions,

it was proven that the solution possessed a uniform compact support after a certain time and even after any positive time. Secondly, under some conditions, it was proven that the solution extinguished at a finite time

by using the L1 norm estimates of the solution to the problem at different times.

Keywords: quasilinear parabolic equation; strong absorption term; compact support; extinction

收稿日期: 2024-12-06.

第一作者簡介: 李亞楠(1999—), 女, 漢族, 碩士研究生, 從事非線性擴散方程的研究, E-mail: yanan22@mails.jlu.edu.cn.

通信作者簡介: 王春朋(1975—), 男, 漢族, 博士, 教授, 博士生導師, 從事退化和混合型偏微分方程的研究, E-mail: wangcp@jlu.edu.cn.

基金項目: 吉林省自然科學基金面上項目(批準號: 20230101001JC).

0 引 言

參考文獻

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(責任編輯: 趙立芹)

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