A TREE WITH A LOOP
by dr. Paweł Pilarczyk
The above photograph is a counterexample to the statement
spread all over computer science which says that no tree has loops.
The counterexample was found at the Appalachian Trail in Georgia, U.S.A.,
on November 30, 2002.
The author of the photograph expects that this discovery will deeply impact
the understanding of the basics of graph theory
and revolutionize the approach to computer science in general.