Nous considérons l'équation ut=Δϕ(u), où ϕ∈C3(0,∞) est croissante. Sous l'hypothèse ν·sϕ″(s)/ϕ′(s)⩾γ pour un γ>0 et ν∈{−1;1}, nous montrons l'estimation ν·du/dt⩾−u/γt. Ce résultat améliore les estimations donnée par M.G. Crandall et M. Pierre (dans J. Funct. Anal. 45 (1982) 194–212) pour cette équation.
We consider the equation ut=Δϕ(u), where ϕ∈C3(0,∞) is increasing. Under the condition ν·sϕ″(s)/ϕ′(s)⩾γ for some γ>0 and ν∈{−1;1}, we prove the estimate ν·du/dt⩾−u/γt. This result improves the estimates given by M.G. Crandall and M. Pierre (in J. Funct. Anal. 45 (1982) 194–212) for this equation.
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@article{CRMATH_2003__336_12_991_0, author = {Chasseigne, Emmanuel}, title = {Une estimation de type {Aronson{\textendash}B\'enilan}}, journal = {Comptes Rendus. Math\'ematique}, pages = {991--996}, publisher = {Elsevier}, volume = {336}, number = {12}, year = {2003}, doi = {10.1016/S1631-073X(03)00255-3}, language = {fr}, url = {http://www.numdam.org/articles/10.1016/S1631-073X(03)00255-3/} }
TY - JOUR AU - Chasseigne, Emmanuel TI - Une estimation de type Aronson–Bénilan JO - Comptes Rendus. Mathématique PY - 2003 SP - 991 EP - 996 VL - 336 IS - 12 PB - Elsevier UR - http://www.numdam.org/articles/10.1016/S1631-073X(03)00255-3/ DO - 10.1016/S1631-073X(03)00255-3 LA - fr ID - CRMATH_2003__336_12_991_0 ER -
Chasseigne, Emmanuel. Une estimation de type Aronson–Bénilan. Comptes Rendus. Mathématique, Tome 336 (2003) no. 12, pp. 991-996. doi : 10.1016/S1631-073X(03)00255-3. http://www.numdam.org/articles/10.1016/S1631-073X(03)00255-3/
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