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By identifying two opposite sides of a rectangle, we get a cylinder. See also the interact...
How to get a bitorus from a decagon: this is the sixth and last step. Here you can see the...
How to get a bitorus from a decagon: this is the fifth step. Here you can see the fourth s...
How to get a bitorus from a decagon: this is the fourth step. Here you can see the fifth s...
How to get a bitorus from a decagon: this is the third step. Here you can see the fourth s...
How to get a bitorus from a decagon: this is the second step. Here you can see the third s...
How to get a bitorus from a decagon: this is the first step. Here you can see the second s...
A figure eight knot. The image has been used at the exhibition matemilano.
If we attach the ends of the rop, we get an figure eight knot.
A fake (or trivial) knot. The image has been realized for the exhibition matemilano.
