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Page 9, Images from Paul Halmos Photograph Collection: Burkholder, Butzer, Calderon, Chern, et al
A great book from which to learn and teach the subject of relativity.
The Arithmetic of Boethius (480-524) dates from the early sixth century. This page is from a mansucript (Plimpton MS 165) that dates from approximately 1294, written on vellum.
A man and his wife drink a barrel of wine at different rates. Find the rate it takes both of them together to drink the wine.
How much does Landowner A give to each worker knowing Landowner B gives a certain amount more and has few workers.
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.
Two men rent a pasture for 100 liras on the understanding that two cows are to be counted as being equivalent to three sheep. The first puts in 60 cows and 85 sheep; the second 80 cows and 100 sheep. How much should each pay?
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.
Age
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.

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