Book's web site http://faculty.luther.edu/~macdonal/vagc/index.html Principle of Maximum Entropy http://en.wikipedia.org/wiki/Principle_of_maximum_entropy Wolfram Mathematica Online Integrator http://integrals.wolfram.com/index.jsp Fundamental Theorem of Calculus http://arxiv.org/abs/0809.4526 Planimeter http://en.wikipedia.org/wiki/Pressure_volume_diagram http://en.wikipedia.org/wiki/Planimeter The Tau Manifesto http://tauday.com/tau-manifesto http://geocalc.clas.asu.edu/html/GeoCalc.html Frenet-Serret in nD http://en.wikipedia.org/wiki/Differential_geometry_of_curves#n_dimensions_.28general_formula.29 Frenet-Serret animation http://en.wikipedia.org/wiki/Frenet-Serret_formulas#Graphical_Illustrations Gauss-Bonnet theorem http://en.wikipedia.org/wiki/Gauss-Bonnet_theorem Euler characteristic http://en.wikipedia.org/wiki/Euler_characteristic p. 171 Software