# Category Archives: pictures

## The First Six Books of the Elements of Euclid, by Oliver Byrne (Taschen)

Recently for my birthday I received a copy of Oliver Byrne’s 1847 edition of Euclid’s Elements (pictured at right), republished by Taschen Books in 2010. I’ve only just started reading it, but it’s beautiful and fascinating. Oliver Byrne was a … Continue reading

Posted in books, geometry, pictures | Tagged , , , , , , | 3 Comments

## A few words about PWW #27

The images in my last post were particular realizations of the famous Sieve of Eratosthenes. The basic idea of the sieve is to repeatedly do the following: Circle the next number bigger than that is not yet crossed out, call … Continue reading

Posted in pattern, pictures, posts without words, primes | Tagged , , | 4 Comments

## Post without words #27

Posted in pattern, pictures, posts without words, primes | Tagged , , | 7 Comments

## Post without words #23

Posted in pattern, pictures, posts without words | Tagged , , , | 11 Comments

## From primitive roots to Euclid’s orchard

Commenter Snowball pointed out the similarity between Euclid’s Orchard… …and this picture of primitive roots I made a year ago: At first I didn’t see the connection, but Snowball was absolutely right. Once I understood it, I made this little … Continue reading

Posted in pattern, pictures, posts without words | Tagged , , , , , | Comments Off on From primitive roots to Euclid’s orchard

## A few words about PWW #20

A couple commenters quickly figured out what my previous post without words was about. The dots making up the image are at integer grid points , with the center at . There is a dot at if and only if … Continue reading

Posted in pattern, pictures, posts without words | Tagged , , | 10 Comments

## Post without words #20

Posted in pattern, pictures, posts without words | Tagged , , | 7 Comments

## Post without words #19

Posted in pattern, pictures, posts without words | Tagged , , , , , , | 2 Comments

## Post without words #18

Posted in pattern, pictures, posts without words | Tagged , , , , , , | 5 Comments

## Post without words #17

Posted in pattern, pictures, posts without words | Tagged , , , , | 5 Comments