Yalçın, Numan; Çelik, Ercan

In this study, taking properties of Cauchy-Euler differential equation and Legendre differential equation, which are particular instances of linear differential equations with variable coefficients in classical analysis, as a basis, definitions of multiplicative Cauchy-Euler differential equation and multiplicative Legendre differential equation , which are types of multiplicative linear differential equations in multiplicative analysis, are given and also their solutions are investigated. In addition, multiplicative reduction of order method is given.

Gökdoğan, Ahmet; Ünal, Emrah; Çelik, Ercan

Recently, a new definition of fractional derivative called as the conformable fractional derivative which based on limits introduced by Khalil et al (2014). Later, Abdeljawad (2015) improved these definitions and gave the basic concepts in this new fractional calculus. In this paper, we generalize Abel's formula and Wronskian determinant definition and establish existence and uniqueness theorems for sequential linear conformable fractional differential equations.

Ünal, Emrah; Yalçin, Numan; Çelik, Ercan; Ashyralyev, A; Malkowsky, E

In this paper, Hartley series are presented first. Then, the operational matrix of integration together with the product and coefficient matrices are presented. They are used to transform linear differential equation systems to a set of linear algebraic equations. Finally, numerical examples are given.