A study was conducted to investigate the effect on concept difficulty of: a.) the number of defining attributes, and b.) the level of conceptualization (LC) of the concepts' attributes. One hundred ...

The principle behind On Numbers' fan difficulty index is a simple one: It's easier to root for a professional sports team that wins. Ratings were generated for the 122 teams in the four major sports: ...

The Atiyah-Singer index theorem gives a topological formula for the index of an elliptic differential operator. The topological index depends on a cohomology class that is constructed from the ...