But no satisfactory mathematical theory of concept-similarity has been developed yet.

This includes articles on shape characteristics, as well as mathematical theory in differential geometry and the like.

Whenever this happens, mathematical theory behind the equations can be viewed as a unifying principle behind diverse phenomena.

Borrowing heavily from population genetics and epidemiology, this book built a mathematical theory concerning the spread of cultural traits.

Papers in operations research journals on mathematical theory often contain supporting numerical results from computational studies.