Penurunan formula eksplisit dari polinomial chebyshev menggunakan komposisi fungsi pembangkit = Deriving explicit formula of chebyshev polynomials by using composition of generating functions

Perumusan jumlah permutasi dari N bilangan asli pertama dengan index dan banyaknya inversi tertentu.

Fungsi Mathieu

Theory and problems of complex variables : with an introduction to conformal mapping and its applications

Kriteria osilasi persamaan diferensial linier homogen orde dua = Oscillation criteria for homogenous second order linear differential equations