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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...
A three-components knot. The three threads are mutually untied (all the possible couples o...
We can cut a torus along a simple, closed curve and it won't divide in two parts. See als...
We can cut a torus along a simple, closed curve and it won't divide in two parts. See also...
By identifying opposite sides of a rectangle, we get a torus. See also the interactive ani...
