Graph reconfiguration and colouring problems investigate the transition between feasible solutions of a graph colouring instance. The central challenge is to determine a series of elementary vertex ...

As an undergraduate at the University of Chile, Bernardo Subercaseaux took a dim view of using computers to do math. It seemed antithetical to real intellectual discovery. “There’s some instinct or ...

I have a Sharp 32J-S400 32" TV and it's about 4 years old. Recently, the colors in the bottom left corner of the TV (a 2" quarter circle extending directly from the corner) have been off. <P>If that ...

Earlier this week we looked at ways make basic contrast fixes in iPhoto’s histogram. Now that you know a bit about how the histogram works, you can tackle one of the most challenging image problems to ...

Have you ever tried to do the brainteaser below, where you have to connect the dots to make the outline of a house in one continuous stroke without going back over your lines? Or perhaps you've ...

A year after he started his Ph.D. in mathematics at McGill University, Matt Bowen had a problem. “I took my qualifying exams and did absolutely horribly on them,” he said. Bowen was sure that his ...

Fifty years ago, Paul Erdős and two other mathematicians came up with a graph theory problem that they thought they might solve on the spot. A team of mathematicians has finally settled it. In the ...

All the Latest Game Footage and Images from Npc Problems: Vertex Coloring In the world, there are some problems that cannot be solved by today's computers. Being necessary the use of artificial ...

Embed <iframe src="https://www.npr.org/player/embed/4254287/4254288" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player"> NPR's ...

Artist unknown, “Emily Noyes Vanderpoel in her home” (ca. 1920), (photograph courtesy Litchfield Historical Society) Though her name is virtually unknown today, Emily Noyes Vanderpoel enjoyed a modest ...

In the fall of 1972, Vance Faber was a new professor at the University of Colorado. When two influential mathematicians, Paul Erdős and László Lovász, came for a visit, Faber decided to host a tea ...