### Blog Stats

- 15,456 hits

### Last visits

- 3-edge coloring 4 4 color theorem 4ct Alfred Bray Kempe algorithm Brendan McKay Cahit spiral chains color coloring coloring maps colour cubic graphs different edge embedding Euler four Four color four color music four color problem four colors suffice four color theorem Francis Guthrie Fullerene graph graph coloring Graph isomorphism graphs representations Graph theory Gunnar Brinkmann Hamilton homeomorphic impasse isomorphic graphs Java Kempe Kempe chain Kenneth Appel map new features oeis pencil and paper plantri problem proof proper colorings sage sagemath tait Tait coloring theorem tutte Wolfgang Haken
### Blogroll

### Comments

stefanutti on Quotes Todd Gibson on Quotes G.A. on Four color theorem: new i… Four color theorem:… on Four color theorem: back to th… Question about 3-reg… on Four color theorem: simplified… G.A. on Abstract Four color theorem:… on Four color theorem: counterexa… stefanutti on Four color theorem: representa… Guy on Four color theorem: representa… Brian Gordon on Four color theorem: 3-edge col… ### Meta

# Tag Archives: Cahit spiral chains

## Four color theorem: Tait edge coloring and Kempe switch

In this new version of the software you can manually color the edges of a map with three colors (RGB) and apply Kempe coloring switch on a Kempe edge chain (path or loop) (http://en.wikipedia.org/wiki/Kempe_chain).

Posted in math
Tagged 4ct, Cahit spiral chains, four color theorem, Kempe chain, Tait coloring
Leave a comment

## Four color theorem: work in progress

😦 Too many more things to do and little time: Filter out duplicates. I finally found a java library to efficiently filter out all isomorphic graphs. It is a library part if the sspace project. Using it I will be able … Continue reading

Posted in math
Tagged 4ct, Cahit spiral chains, coloring maps, four color theorem, Graph theory, tait, Tait coloring
Leave a comment

## Four color theorem: Cahit spiral chains (step two)

Now the application is able to find all spiral chains of a graph. I still need to: Implement the Cahit coloring algorithm using the spiral chains Add some additional features to the Java application Modify the settings to color the … Continue reading

Posted in Uncategorized
Tagged 4ct, Cahit spiral chains, coloring maps, Four color, Tait coloring
Leave a comment

## Four color theorem: Cahit spiral chains

Hi, I’ve found some time to implement the first version of Cahit Spiral Chains algorithm. I still need to: Find all spiral chains of a given graph and not only one (changing the starting point) I need to implement the … Continue reading

Posted in Uncategorized
Tagged 4ct, Cahit spiral chains, four color theorem, graph coloring, Graph theory, Tait coloring
Leave a comment