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-1 votes
1 answer
43 views

Eulerian trail (or Eulerian path) [closed]

I found this question in one oldie book It is possible to draw figure A below without lifting your pencil in such a way that you never draw the same line twice. However, no matter how hard you try, ...
Ayush Singh's user avatar
1 vote
1 answer
194 views

What graphs have k-Eulerian circuits without backtracking?

Yesterday I asked about k-Eulerian circuits and which graphs have them. What I mean by k-Eulerian circuits is a sequence of edges $\{e_i\}_{i=1}^n$ such that $e_i$ and $e_{i+1}$ are connected to a ...
abnry's user avatar
  • 14.7k
1 vote
2 answers
366 views

Generalization of Euler Circuits that Visit Each Edge $k$-times

It is known that a graph has an Eulerian circuit if and only if each node has even degree. Two questions: (1) What is the term used to describe a cycle (if the right term) that visits each edge in a ...
abnry's user avatar
  • 14.7k
37 votes
12 answers
134k views

Is it possible to draw this picture without lifting the pen?

Some days ago, our math teacher said that he would give a good grade to the first one that will manage to draw this: To draw this without lifting the pen and without tracing the same line more than ...
zdimension's user avatar