User:Z423x5c6/add something

Zero and One are the only Consecutive Perfect Squares
(generalize?)

Complex Numbers as External Direct Product
(explain)

Category:Quaternion Modulus
(refer to Category:Complex Modulus)

Mellin Transform of Heaviside Step Function
(explain)

Trigonometric Functions in terms of each other
(add something)

Dimension of Sum and Intersection of Vector Spaces
(try to create a proof using first isomorphism theorem)