Hello. I seek advise regarding plots. My query is: Is it possible to change the center of a plot in Cartesian coordinates from the default (0,0,0) to another set of values? Would greatly appreciate prompt advise. Best regards, wirefree

Hello, How do I calculate summations represented on paper in the sigma format? Example, part (c) here: http://www.mathhelpforum.com/math-help/151784-post2.html Would appreciate assistance. Best, wirefree

Hello there, Would appreciate if someone could illustrate the procedure to obtain, using the plot3d command, simply the solid bound by the given set of graphs. In other words, all superfluous areas are substracted. For example, for the cone z=sqrt(x^2 + y^2) & planes z=2 & z=4, I'd like to see just the solid bound by the planes and not what appears when the following commands are executed: a:=implicitplot3d(z = sqrt(x^2+y^2), x = -5 .. 5, y = -5 .. 5, z = -5 .. 5); b:=implicitplot3d(z = 2, x = -5 .. 5, y = -5 .. 5, z = -5 .. 5);