Please, take another look at the multiplication table

The Mathematical Gazette / Volume 100 / Issue 547 / March 2016, pp 108 - 111

Note entitled: "100.02 Square pyramidal numbers and the multiplication table"

http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid...

Sum of Cosines and the Improper Integral of Sin(x)/x

www.avidsynergy.com/pdf/SinOfXdividedByXintegration_article.pdf

Here you will find mathematics article for high school and college students: "Error Function, Dirichlet Kernel and the Improper Integral of Sin(x)/x"

www.avidsynergy.com/pdf/sin_x_div_by_x_integral.pdf

Note on calculating Ax(t) = x′(t) and Ax(t) = λx(t) with eigenfunctions x(t) and eigenvalues λ