Journal of Approximation Theory and Applied Mathematics (ISSN 2196-1581) is a journal which started in 2013. Themes of our journal are: Approximation theory (with a focus on wavelets) and applications in mathematics like numerical analysis, statistics or financial mathematics. Contents of Vol. 3: Parameter Identification with a Wavelet Collocation Method , Parameter Identification with a Wavelet Collocation Method in the Black Scholes Equation, Adapted Linear Approximation for Logarithmic Kernel Integrals, Identifying a Superposition with Trigonometric Functions by Applying a MRA with the Shannon Wavelet