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Some knots aren't equivalent to their specular image, but this is not the case of the figu...
If we take three threads and twist them for a while, until we get six crossings, by closin...
The diagram of a knot differs from a projection of the knot on a plane because every cross...
The problem of the three houses: every house must be joined to each of the three points in...
The problem of the three houses on the Moebius strip.You can see also other versions. You ...
A problem of paths, analogous to the classical problem of the Königsberg bridges. In thi...
A problem of paths, analogous to the classical problem of the Königsberg bridges. In thi...
A problem of paths, analogous to the classical problem of the Königsberg bridges. In thi...
The figure eight knot (also called the savoia knot) is the simplest knot after the trefoil...
The figure eight knot (also called the savoia knot) is the simplest knot after the trefoil...
