Well-posedness of semilinear heat equations in L 1
Annales de l'I.H.P. Analyse non linéaire, Tome 37 (2020) no. 3, pp. 709-725.
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The problem of obtaining necessary and sufficient conditions for local existence of non-negative solutions in Lebesgue spaces for semilinear heat equations having monotonically increasing source term f has only recently been resolved (Laister et al. (2016)). There, for the more difficult case of initial data in L1, a necessary and sufficient integral condition on f emerged. Here, subject to this integral condition, we consider other fundamental properties of solutions with L1 initial data of indefinite sign, namely: uniqueness, regularity, continuous dependence and comparison. We also establish sufficient conditions for the global-in-time continuation of solutions for small initial data in L1.

DOI : 10.1016/j.anihpc.2019.12.001
Mots-clés : Heat equation, Existence, Uniqueness, Continuous dependence, Comparison, Global solution
Laister, R. 1 ; Sierżęga, M. 2

1 Department of Engineering Design and Mathematics, University of the West of England, Bristol BS16 1QY, UK
2 Faculty of Mathematics, Informatics and Mechanics, University of Warsaw, Banacha 2, 02-097 Warsaw, Poland
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Laister, R.; Sierżęga, M. Well-posedness of semilinear heat equations in L
         1. Annales de l'I.H.P. Analyse non linéaire, Tome 37 (2020) no. 3, pp. 709-725. doi : 10.1016/j.anihpc.2019.12.001. http://www.numdam.org/articles/10.1016/j.anihpc.2019.12.001/

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