Tag Archives: grid

Post without words #32

Posted on June 8, 2021 by Brent
Posted in posts without words | Tagged , , , | 8 Comments

Post without words #26

Posted on May 6, 2019 by Brent
Posted in modular arithmetic, number theory, posts without words | Tagged , , | 2 Comments

More words about PWW #25: The Chinese Remainder Theorem

Posted on April 5, 2019 by Brent

In a previous post I made images like this: And then in the next post I explained how I made the images: starting in the upper left corner of a grid, put consecutive numbers along a diagonal line, wrapping around … Continue reading →

Posted in modular arithmetic, number theory, posts without words | Tagged , , , , | 3 Comments

A few words about PWW #25

Posted on March 9, 2019 by Brent

In my previous post I made images like this: What’s going on? Well, first, it’s easy to notice that each grid starts with in the upper-left square; is one square down and to the right of , then is one … Continue reading →

Posted in modular arithmetic, number theory, posts without words | Tagged , , , , | 4 Comments

Post without words #25

Posted on March 5, 2019 by Brent
Posted in modular arithmetic, number theory, posts without words | Tagged | 4 Comments

Link: Chat Noir

Posted on December 16, 2015 by Brent

Just a link for you today: Chat Noir is a fun game where you try to trap a cat before it escapes. It’s quite mathematical, too. Can you figure out strategies for trapping the cat? Can you always win, or … Continue reading →

Posted in games, geometry, links | Tagged , , , , , , , , | 1 Comment

17×17 4-coloring with no monochromatic rectangles

Posted on February 9, 2012 by Brent

Quick, what’s special about the following picture? As just announced by Bill Gasarch, this is a grid which has been four-colored (that is, each point in the grid has been assigned one of four colors) in such a way that … Continue reading →

Posted in open problems, pattern, people, pictures | Tagged , , , , , | 5 Comments