The infinite geometric series is any series of the form      `sum_(n=0)^infty ar^n`. 

In differential equations, mixing problems are used to model concentrations of a substance dissolved in a fluid. 

In differential equations, mixing problems are used to model concentrations of a substance dissolved in a fluid. This can include anything from salt content in water to pollution in air. When doing mixing problems, we make the following assumptions:

The nth Fibonacci Number (Closed form) function returns nth Fibonacci number using the closed form formula below. 

The O'Conner one Rep Max Weight calculator computes the approximate maximum weight one can lift using the O'Conner formula. 

The Row Echelon Form of a 3x3 Matrix calculator takes a 3x3 matrix and computes the row-echelon form.

The SIR Epidemic Model provides information on the increase or decrease of an epidemic based on the infection rate, recovery rate, total population, initial susceptible population, initial infected population and the initial recovered population. 

The SIS Epidemic Model calculator computes the basic reproduction number and the portion of the population susceptible.