Diophantus of Alexandria

Hello, my name is Diophantus. I lived in the amazing city of Alexandria in Egypt around the year 250 CE. My home was a center of knowledge, famous for its Great Library. I spent countless hours there, surrounded by scrolls of information. While most people used numbers just for counting things like coins or sheep, I saw them differently. To me, numbers were like keys that could unlock fascinating puzzles. I believed the world of numbers held all sorts of mysteries, and I wanted to be the one to solve them.

In my time, math problems were not written with plus or minus signs. Instead, people wrote everything out in long, descriptive sentences. Imagine trying to solve a puzzle that was told like a long story. It could be very confusing. I thought there must be a better way. So, I came up with a big idea. I started using symbols, like a secret code, to stand for numbers that were unknown. This was a completely new way of thinking. My system of shorthand turned those long word problems into much shorter, clearer equations that were easier to work with. This method was the very beginning of what you now call algebra.

I poured all of my ideas into my life's work, a collection of books I named Arithmetica. I wrote this series around the year 250 CE. It was a huge project, made up of 13 separate books, and inside, I included over 150 different math problems for others to solve. The puzzles in my books were a special type, which today are called Diophantine equations. The challenge was to find answers that were whole numbers, not fractions or decimals. It was a fun and tricky way to test your mind. Sadly, over the many centuries that have passed, some of my original 13 books have been lost, but the ones that remain have taught people about numbers for a very long time.

Not much is known about my family or my everyday life, because so much time has passed. However, a famous riddle about me has survived. After I passed away around the year 285 CE, this riddle was supposedly carved on my tombstone. It’s a clever number puzzle that tells the story of my life using fractions. It explains how long my childhood was, when I got married, and even how long my son lived. If you can solve this special math problem, it will tell you exactly how old I was at the end of my life.

If you solve the riddle from my tomb, you will discover that I lived to be 84 years old. Today, I am often remembered as the 'father of algebra' because of the new ways I thought about numbers. My work in Arithmetica inspired mathematicians for over a thousand years, including a very famous thinker named Pierre de Fermat. It makes me happy to know that the ideas I developed so long ago in Alexandria are still the foundation of the algebra that students like you learn in school today.