Separators in string graphs - is statement correct?

http://garden.irmacs.sfu.ca/?q=op/separators_in_string_graphs
1. The n-complete graph is a string graph, isn't it? It is easy to draw n curves where any intersects any.
2. And where is the separator in the complete graph?

Suggestion: Catalog of open problem sites

I suggest to add to Open Problem Garden a directory of Web pages dedicated to open problems in mathematics. This way the both sides would benefit from circular links, making our Google ranks higher.

The Prime Puzzles and Problems Connection

At this URL there are more (currently 63) conjectures than in Number Theory section of OPG (currently 31). So some of the problems from there are missing here.

Abelian Patterns

It seems that the following problems (about so called Abelian Patterns) are missing in our garden:

http://io.uwinnipeg.ca/~currie/abelian%20patterns.html

I suggest somebody to add them.

Topics: Theoretical Computer Science

What topics and subtopics should there be under the subject "Theoretical Computer Science"? Just more specific than the "Give us your suggestions" thread.

"Problems in Modern Mathematics" book

"Problems in Modern Mathematics" book by Stanislaw M. Ulam

I suggest someone to buy this book and enter here the problems from it:

URL at Google Books

Combine Algebra and Group Theory?

I think Group theory should be a sub topic of algebra. Melch

An other list of open problems in graph theory

This site contains a list of 38 open problems: http://www.math.uiuc.edu/~west/openp/index.html These should be added to Open Problem Garden if not yet.

Should delete open problem?

About this open problem: Admins: Should I delete this problem from Open Problem Garden because its solution was too easy (found in less than one day). Or just to leave it marked as solved?

Server error

When submitting a new open problem there happened a server error:

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