Robert Kelly is managing director of XTS Energy LLC, and has more than three decades of experience as a business executive. He is a professor of economics and has raised more than $4.5 billion in ...

A matrix multiplied with its inverse gives the identity matrix. This function finds the inverse of a 2x2 and 3x3 matrix. If the determinant of a matrix is 0, its inverse does not exist.

Complex numbers and Euler’s formula. Differential equations (DE); first-order DE ... scalar and vector products, triple products, 2x2 and 3x3 determinants, applications to geometry, equations of a ...