The work of the great Renaissance artist/scientist Leonardo da Vinci can be taught in secondary schools through an integrated approach of several disciplines. This article explores the approach of the Ross School.

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You have two sums of money, the difference of which is 2 dirhams; you divide the smaller sum by the larger and the quotient is equal to 1/2. What are the two sums of money?

A new edition of a brief history text, arranged topically rather than chronologically.

A new edition of a classic work on number theory.

There are two numbers which are to each other as 5 and 6 and the sum of their squares is 2196. What are the numbers?

Information on previous ESUs

A history of attempts to develop formulas expressing the sums of powers of the first n positive integers from the Pythagoreans to Jakob Bernoulli. With exercises.

Short sketches on how mathematicians work and think.

Now there are six-headed four legged animals and four-headed two-legged birds. Find the total number of animals and birds.

A ladder has 100 steps. On the first step sits 1 pigeon; on the second, 2; on the third, 3; and so on up to the hundredth. How many pigeons in all?