The triangle ABC has a right angle at C. Show that 1/ED=1/AC+1/AB

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The triangle ABC has a right angle at C. Show that 1/ED=1/AC+1/AB

A gallery of episodes from the history of calculus.

If I were to give 7 pennies to each beggar at my door, I would have 24 pennies left in my purse. How many beggars are there and how much money do I have?

A tree is 20 feet tall and has a circumference of 3 feet. There is a vine that winds seven equally spaced times around the tree and reaches the top. What is the length of the vine?

A gentleman has a garden of rectangular form and wants to construct a walk of equal width half way round to take up half the garden. What must be the width of this walk?

A section of a much larger website, dealing with some random topics in the history of mathematics.

A cultural history of the infinite, from ancient to modern times, in which the author clarifies the conceptual underpinnings of this vast topic.

Download the three winning essays to learn about Kepler's mathematical astronomy, the roots of modern algebra, and the Quadrivium of Isidore of Seville.

A number of 3 digits in base 7 has the same three digits...

This website contains a complete version of Euclid's Elements, with all the proofs.