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An exhibit of "Matematica viva", in Lisbon (Portugal) that shows that we need six colours ...
The solution of the problem of the three houses on the Moebius strip. You can also try to ...
How to get a bitorus from a decagon: this is the first step. Here you can see the second s...
By identifying opposite sides of a rectangle, we get a torus. See also the interactive ani...
Se prendiamo una sfera "normale" nello spazio ordinario, il suo complementare e' fatto di ...
This blanket represents a map of 24 paired regions; a couple of regions is identified by t...
The solution of the problem of the three houses on a torus. You can also try to solve thi...
By identifying the opposite sides of a rectangle you get a torus. See also the interactive...
The figure shows a map on a Moebius strip which consists of six regions, each of them is a...
The animation shows how to colour a map on the Moebius strip; the map consists of six regi...
