The only known things about my life are found in this 5th century math puzzle: "'Here lies XXXXXXXXX,' the wonder behold. Through art algebraic, the stone tells how old: 'God gave him his boyhood onesixth of his life, One twelfth more as youth while whiskers grew rife; And then yet oneseventh ere marriage begun; In five years there came a bouncing new son. Alas, the dear child of master and sage After attaining half the measure of his father's life chill fate took him. After consoling his fate by the science of numbers for four years, he ended his life."
As a Greek mathematician in Alexandria, I authored the Arithmetica, the earliest systematic presentation on what is now known as algebra.
The majority of the problems in Arithmetica led to creating equations that were either determinate or indetermuinate (e.g. system of 2 linear equations but 3 unknowns).
I was the first to use conventional algebraic notation, replacing words by symbols....but was limited by the use of only one symbol for the unknown.
If my equations had solutions that were not real, rational, and positive...the other solutions were ignored.
A copy of my book is connected to Fermat and the famous "margin" story.
Answer:
Diophantus (circa 200  284)
