Diophantus is considered the father of algebra. He was the writer of 13 books called "Arithmetica," but only six of those books have survived to modern day.
The books that Diophantus authored contain the earliest known use of syncopated notation. An entire area of study is named after the Greek mathematician, called Diophantine analysis and Diophantine equations. The analysis portion is where whole number solutions are looked for as the answer to equations. Diophantine equations are polynomial equations with whole number coefficients and only solutions with whole number answers are sought to solve them. It has been debated if Diophantus is truly the father of algebra or if the honor should go to one of the older mathematicians in history.