A closed knight’s tour of a chessboard uses legal moves of the knight to visit every square exactly once and return to its starting position. When the chessboard is translated i...
Consider partial maps Σ∗ −→ with a rational domain. We show that two families of such series are actually the same: the unambiguous rational series on the one hand, and ...
We establish a new lower bound for the number of sides required for the component curves of simple Venn diagrams made from polygons. Specifically, for any n-Venn diagram of conve...