# Category Archives: posts without words

## A few words about PWW #33: subset permutations

My previous post showed four rows of diagrams, where the th row (counting from zero) has diagrams with dots. The diagrams in the th row depict all possible paths that start at the top left dot, end at the top … Continue reading

Posted in combinatorics, posts without words | Tagged , , , | 6 Comments

## Post without words #33

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## Post without words #32

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## Post without words #31

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## A few words about PWW #30

A few things about the images in my previous post that you may or may not have noticed: As several commenters figured out, the th diagram (starting with ) is showing every possible subset a set of items. Two subsets … Continue reading

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## Post without words #30

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## Post without words #29

(This variant was requested by Mark Dominus.)

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## Post without words #28

Posted in posts without words | Tagged , , | 12 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