*Euclid's Elements*discusses Proposition 32 of Book II.

## Saturday, October 29, 2011

## Saturday, October 22, 2011

### Seki Kowa's Essentials of Mathematics

## Saturday, October 15, 2011

### Nasir al-Din al-Tusi's Commentary on Euclid's Elements

Nasir al-Din al-Tusi (1201 – 1274) was a Persian astronomer and mathematician. He is noted for writing the first major work on pure trigonometry as well as for his commentaries on Greek works.

This is a page from a later Arabic edition of his commentary on Euclid’s

*Elements,*a page dealing with Euclid's method of exhaustion.## Saturday, October 8, 2011

### Benedetto da Firenze's Trattato d'arismetriche

Benedetto da Firenze (1429 – 1479) was a respected Florentine *maestro d’abaco*. Here, on page 114 of his unpublished manuscript *Trattato d’arismetricha* (ca 1460), a work on mercantile arithmetic, is a discussion of *regula del chataina,* the chain rule, used to compute exchange rates.

## Saturday, October 1, 2011

### Euclid's Elements in a 14th century manuscript

This image is from a late 14th century manuscript containing the first five books of Euclid's

*Elements*in Latin translation. The manuscript probably comes from England, but the scribe is unknown.This page is f. 10, and contains three results from Book II, often characterized as results in geometric algebra.

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