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Singular solutions for the differential equation with p -Laplacian

Miroslav Bartušek (2005)

Archivum Mathematicum

In the paper a sufficient condition for all solutions of the differential equation with p -Laplacian to be proper. Examples of super-half-linear and sub-half-linear equations ( | y ' | p - 1 y ' ) ' + r ( t ) | y | λ sgn y = 0 , r > 0 are given for which singular solutions exist (for any p > 0 , λ > 0 , p λ ).

Some classes of linear n th-order differential equations

Valter Šeda (1997)

Archivum Mathematicum

Sufficient conditions for the n -th order linear differential equation are derived which guarantee that its Cauchy function K , together with its derivatives i K t i , i = 1 , , n - 1 , is of constant sign. These conditions determine four classes of the linear differential equations. Further properties of these classes are investigated.

Stability and optimal harvesting of a prey-predator model with stage structure for predator

Tapan Kumar Kar (2005)

Applicationes Mathematicae

The dynamics of a prey-predator system, where predator has two stages, a juvenile stage and a mature stage, is modelled by a system of three ordinary differential equations. Stability and permanence of the system are discussed. Furthermore, we consider the harvesting of prey species and obtain the maximum sustainable yield and the optimal harvesting policy.

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