Images for Mathematics

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Colouring a Moebius strip

An exhibit of "Matematica viva", in Lisbon (Portugal) that shows that we need six colours ...

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The problem of the three h...

The solution of the problem of the three houses on the Moebius strip. You can also try to ...

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From a decagon to a bitorus

How to get a bitorus from a decagon: this is the first step. Here you can see the second s...

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Cutting a torus

By identifying opposite sides of a rectangle, we get a torus. See also the interactive ani...

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Una sfera cornuta

Se prendiamo una sfera "normale" nello spazio ordinario, il suo complementare e' fatto di ...

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Twelve colours for the map...

This blanket represents a map of 24 paired regions; a couple of regions is identified by t...

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The problem of the three h...

The solution of the problem of the three houses on a torus. You can also try to solve thi...

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From a rectangle to a torus

By identifying the opposite sides of a rectangle you get a torus. See also the interactive...

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Colouring a Moebius strip

The figure shows a map on a Moebius strip which consists of six regions, each of them is a...

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Six colours for the Moebiu...

The animation shows how to colour a map on the Moebius strip; the map consists of six regi...

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