The tree command is perfect for viewing your entire directory structure at a glance. It shows folders and files in a clear, ...

Abstract: The tree (hierarchical) structure is one of the elementary memory arrangements, used by numerous data structures – ranging from simple to relatively sophisticated ones. The most well-known ...

How do you count rooted planar n n-ary trees with some number of leaves? For n = 2 n = 2 this puzzle leads to the Catalan numbers. These are so fascinating that the combinatorist Richard Stanley wrote ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. But if something has the right feeling then I like it; it doesn’t matter what genre it belongs to ...

I enjoyed your article in the Oct. 3 La Jolla Light (“Parks & Beaches group launches project to maintain public access to La Jolla Cove”). For what it is worth, I would like to share my perspective. I ...