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Some logarithmic functional equations

Vichian Laohakosol, Watcharapon Pimsert, Charinthip Hengkrawit, Bruce Ebanks (2012)

Archivum Mathematicum

The functional equation f ( y - x ) - g ( x y ) = h 1 / x - 1 / y is solved for general solution. The result is then applied to show that the three functional equations f ( x y ) = f ( x ) + f ( y ) , f ( y - x ) - f ( x y ) = f ( 1 / x - 1 / y ) and f ( y - x ) - f ( x ) - f ( y ) = f ( 1 / x - 1 / y ) are equivalent. Finally, twice differentiable solution functions of the functional equation f ( y - x ) - g 1 ( x ) - g 2 ( y ) = h 1 / x - 1 / y are determined.

Some notes on oscillation of two-dimensional system of difference equations

Zdeněk Opluštil (2014)

Mathematica Bohemica

Oscillatory properties of solutions to the system of first-order linear difference equations Δ u k = q k v k Δ v k = - p k u k + 1 , are studied. It can be regarded as a discrete analogy of the linear Hamiltonian system of differential equations. We establish some new conditions, which provide oscillation of the considered system. Obtained results extend and improve, in certain sense, results presented in Opluštil (2011).

Some properties of solutions of complex q-shift difference equations

Hong-Yan Xu, Jin Tu, Xiu-Min Zheng (2013)

Annales Polonici Mathematici

Combining difference and q-difference equations, we study the properties of meromorphic solutions of q-shift difference equations from the point of view of value distribution. We obtain lower bounds for the Nevanlinna lower order for meromorphic solutions of such equations. Our results improve and extend previous theorems by Zheng and Chen and by Liu and Qi. Some examples are also given to illustrate our results.

Some properties of the jacobian sn z function.

István Fenyö (1985)

Stochastica

Using some results of the theory of functional equations we deduce some properties of the Jacobian sn z function which seem to be new. Some functional equations have also been found which are fulfilled by the sn z function which the author did not find in the literature.

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