نبذة مختصرة : We deal with some generalizations on a Black-Scholes model arising in financial mathematics. As a novelty in this paper, we consider a variable volatility and abstract functional boundary conditions, which allow us to treat a very large class of problems involving Black-Scholes equation. Our main results involve the existence of extremal solutions in presence of lower and upper solutions. Some examples of applications are provided too. ; The first author was partially supported by Xunta de Galicia, Consellería de Cultura, Educación e Ordenación Universitaria, through the project EM2014/032 ‘Ecuacións diferenciais non lineares’; and by Ministerio de Economía y Competitividad of Spain under Grant MTM2010-15314, cofinanced by the European Community fund FEDER. The second author was partially funded by Fundação para a Ciência e Tecnologia through the project UID/Multi/00491/2013 and the Transnational Cooperation FCT Portugal-Slovakia ‘Analysis of Nonlinear Partial Differential Equations in Mathematical Finance (2013-2014)’ and by the EU Grant Program FP7-PEOPLE-2012-ITN STRIKE - ‘Novel Methods in Computational Finance’, No. 304617 (D.S.). ; SI
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