Multivariable Calculus Applets (Popularity: ): Features graphing gradients, parametric, and polar curves, matrix manipulation, and a tutorial on determinants. Multivariable Calculus (Popularity: ): A nicely organized and detailed study of calculus of 3 or more variables topics. Includes a review of minimum and maximum problems and vectors. Multivariable Calculus Problems (Popularity: ): Various calculus problems are solved and plotted on a 3D graph. Multivariable Calculus Examples (Popularity: ): An interactive tutorial of multivariable calculus. A lot of work with graphics. Requires the use of DPG programming to participate in the examples. Multivariable Calculus (Popularity: ): Textbook by George Cain and James Herod. Chapters in PDF. 4DLab - Easy equation plotting for real, complex, and transcomplex numbers (Popularity: ): 4DLab is a web site focused on complex and transcomplex numbers. Sections on free math E-Books, articles about the mathematical fourth dimension, and the Cartesian spaces.