Community articles — Math

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Discret Hartley Transform is a unitary transform although its proof is hard to find in the Web. This short note explains that the Discrete Hartley Transform is an involution, which implies that this transform is unitary indeed.

Some notes on combinatorics

Cramer's rule is usually explained by cofactor expansion of determinant. This note explains two alternative and simple proofs.

Notes on quadratic functions for Mathematics Standard Level (Hey Mr.Zamar)

A Statistics paper on Correlation and Linear Relationships.

A solution for CSI500 project 3

trabajo realizado para la cátedra de señales y sistemas

Math 206 homework