A GNU-FDL book on algorithmic graph theory by David Joyner, Minh Van Nguyen, and Nathann Cohen. This is an introductory book on algorithmic graph theory. Theory and algorithms are illustrated using the Sage open source mathematics software.
the home for language courses developed by the Foreign Service Institute. These courses were developed by the United States government and are in the public domain. This site is not affiliated in any way with any government entity; it is an independent, non-profit effort to foster the learning of worldwide languages.
The art of guessing results and solving problems without doing a proof or an exact calculation. Techniques include extreme-cases reasoning, dimensional analysis, successive approximation, discretization, generalization, and pictorial analysis. Application to mental calculation, solid geometry, musical intervals, logarithms, integration, infinite series, solitaire, and differential equations.