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the torus knot of type (2,0) consists of two untied circumpherences. You can see what happ...
How to get a torus knot of type (3,k). Third step: before pasting the cylinder, we give a ...
How to get a torus knot of type (3,k). Second step: we roll up the cylinder to form a toru...
How to get a torus knot of type (3,k). First step: we take three line segments drawn on a ...
How to prove that the problem of the three houses on the plane has no solution. We should ...
How to prove that the problem of the three houses on the plane has no solution: in the fig...
How to prove that the problem of the three houses on the plane has no solution. We should ...
How to prove that the problem of the three houses has no solution on the plane. We should ...
A trefoil knot on a capital in the courtyard of S.Ambrogio church, in Milan.
A decoration on the floor of the Galleria, in Milan. If we imagine to paste the ends, we g...
