8 research outputs found

    Nonlinear Parabolic Equations arising in Mathematical Finance

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    This survey paper is focused on qualitative and numerical analyses of fully nonlinear partial differential equations of parabolic type arising in financial mathematics. The main purpose is to review various non-linear extensions of the classical Black-Scholes theory for pricing financial instruments, as well as models of stochastic dynamic portfolio optimization leading to the Hamilton-Jacobi-Bellman (HJB) equation. After suitable transformations, both problems can be represented by solutions to nonlinear parabolic equations. Qualitative analysis will be focused on issues concerning the existence and uniqueness of solutions. In the numerical part we discuss a stable finite-volume and finite difference schemes for solving fully nonlinear parabolic equations.Comment: arXiv admin note: substantial text overlap with arXiv:1603.0387

    Monotonicity Of The Lagrangian Function In The Parametric Interior Point Methods Of Convex Programming

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    . Monotonicity of the Lagrangian function corresponding to the general root quasibarrier as well as to the general inverse barrier function of convex programming is proved. It is shown that monotonicity generally need not take place. On the other hand for LP-problems with some special structure monotonicity is proved for a very general class of interior point transformation functions. 1. Introduction Current interest in interior point methods for linear programming was sparked by the 1984 algorithm of N. Karmarkar [7] that is claimed to be much faster than the simplex method for practical problems. The equivalence of Karmarkar's projective scaling method to interior point methods was pointed out by Gill and others in 1986 [4]. Since then the interior point methods for convex programming have been intensively studied again. Recently some attention has been given to the monotonicity of the corresponding Lagrangian function (with respect to the considered parameter). The known results co..

    Duality Of Transformation Functions In The Interior Point Methods

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    . In this paper a duality of transformation functions in the interior point method is treated. A dual pair of convex or linear programming problems is considered and the primal problem is transformed by the parametrized transformation function of a more general form than logarithmic is. The construction of the parametrized transformation function for the dual problem is carried out so that both transformation functions were dual. The result obtained explains the unlucid construction of dual transformation functions so far known as a special case of a simple general principle of constructing dual transformation functions. 1. Introduction In the framework of the interior point methods (IPM) the linear programming problem (LP) min \Phi c T x j Ax = b; x 0 \Psi ; x; c 2 R n ; b 2 R m ; A 2 R m\Thetan is solved using logarithmic transformation function (1) T (x; 炉) = c T x \Gamma 炉 n X i=1 ln x i where x 2 P o = fx j Ax = b; x ? 0g and 炉 ? 0 is a parameter. The standard..

    Determining of accurracy of drawing, preparation and analysis of biofuels samples and fuels of waste origin

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    Wzrost udzia艂u biopaliw i sta艂ych paliw wt贸rnych jako 藕r贸de艂 energii w bilansie paliwowo- -energetycznym przyczynia si臋 do poprawy efektywno艣ci wykorzystania i do oszcz臋dzania zasob贸w surowc贸w energetycznych oraz do redukcji ilo艣ci wytwarzanych odpad贸w. W Polsce, coraz cz臋艣ciej spala si臋 biomas臋 i sta艂e paliwa wt贸rne z w臋glem, jako mieszanki energetyczne. Istnieje zatem potrzeba opracowania szczeg贸艂owych procedur w zakresie pobierania i przygotowywania pr贸bek biopaliw i sta艂ych paliw wt贸rnych. W procedurach tych powinno by膰 uwzgl臋dnione zr贸偶nicowanie tych paliw pod wzgl臋dem jako艣ci, uziarnienia i zag臋szczenia. W artykule przedstawiono wytyczne dotycz膮ce sposobu pobierania pr贸bek do bada艅 fizykochemicznych i okre艣lania dok艂adno艣ci pobierania. W celu zoptymalizowania sposobu opr贸bowania biomasy lub sta艂ych paliw wt贸rnych wykonano badania wp艂ywu uziarnienia, wielko艣ci i liczby pr贸bek pierwotnych na precyzj臋 opr贸bowania. Na podstawie uzyskanych wynik贸w stwierdzono, 偶e w przypadku wi臋kszo艣ci biopaliw sta艂ych i sta艂ych paliw wt贸rnych optymalna liczba pr贸bek pierwotnych, kt贸re nale偶y pobra膰 z partii do 1000 t, powinna wynosi膰 minimum 36, w przypadku mieszanek sta艂ych paliw wt贸rnych, nale偶y pobra膰 minimum 54 pr贸bki pierwotne. W przypadku biopaliw, kt贸re charakteryzuj膮 si臋 ma艂ym zr贸偶nicowaniem jako艣ciowym (zr臋bki, trociny) wystarczy pobranie pr贸bek pierwotnych o masie nie mniejszej ni偶 1,5 kg. Pr贸bki pierwotne mieszanek sta艂ych paliw wt贸rnych powinny mie膰 mas臋 minimum 3 kg. dla trocin i mieszanek r贸偶nego rodzaju paliw wt贸rnych najlepsze wyniki uzyskano przy rozdrobnieniu poni偶ej 1 mm. W przypadku odpad贸w butelkowych pet i zr臋bek drzewnych, ze wzgl臋du na ich jednorodno艣膰 pod wzgl臋dem zawarto艣ci popio艂u, wystarczaj膮ce jest rozdrobnienie do uziarnienia poni偶ej 2 mm

    Assessment of atrazine toxicity to the estuarine phytoplankter, Dunaliella tertiolecta (Chlorophyta), under varying nutrient conditions

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