What is the chromatic number of Moebius stip?
We are sorry that the answering took so long. There are no math experts in the iGS team, so it took us a while to even understand the subject of you question. Moebius could be referring at least to following concepts: a nervous system disease (Moebius syndrome), an electrorefining technique (Moebius system), a cartoonist (Jean Giraud) or a bagpipe band. Chromatic could refer to music or colors.
In your case Moebius is actually referring to Möbius strip, which according to Britannica Online is a one-sided surface that can be constructed by affixing the ends of a rectangular strip after first having given one of the ends a one-half twist. See also http://mathworld.wolfram.com/MoebiusStrip.html
According to the same Mathworld site the chromatic number of a graph is the minimum number of colors needed to color the vertices of a graph so that no two adjacent vertices have the same color. http://mathworld.wolfram.com/ChromaticNumber.html