In Archimedes' Book of Lemmas (ca 250), he introduces a figure that, due to its shape, has historically been known as "the shoemaker's knife" or arbelos.

Displaying 561 - 570 of 655

What is the sum of the reciprocals of the triangular numbers?

The most popular and authoritative arithmetic book in late 17th and 18th century England, it stayed in print for 100 years.

My age is a number consisting of two digits, 1/2 of this number is a mean proportional between these two digits, and two years hence, my age will be a third proportional to the same two digits, directly as they stand in my present age.

A new history of mathematics in ancient Mesopotamia, concentrating on its social aspects.

There is a lion in a well whose depth is 50 palms. He climbs and slips back a certain amount each day. In how many days will he get out of the well?

A castle has n rooms each of which has 7 samurai in it.

One says that 10 garments were purchased by two men at a price of 72 dirhams. The garments varied in value. The price of each garment of one man is 3 dirhams more than the price for each garment of the other. How many garments did each man buy?

A historically minded textbook designed to teach real analysis by considering some of the problems faced by 19th century mathematicians.

A leech invited a slug for a lunch a leuca away.