High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! The napkin folding problem in geometry explores whether folding a square or a rectangular napkin can increase its perimeter. The problem is known under several names, including the Margulis napkin problem, suggesting it is due to Grigory Margulis, and the Arnold's rouble problem referring to Vladimir Arnold and the folding of a Russian ruble. There is a great deal of confusion as to whether the problem is completely resolved. Versions of the problem were solved by S. Krat, Robert J. Lang, A.S. Tarasov and I. Yaschenko.

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