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...
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...
A solution of the problem of the three houses on the torus. You can also try to solve this...
A solution of the problem of the three houses on the Moebius strip. You can also try to so...
The problem of Königsberg bridges: is there a path around the town that crosses one and j...
