geordief's latest activity

So I take your (and,presumably eveyone else's) word that the tangent planes of a sphere (and presumably of any "uneven sphere" ) can be...

@A.T. Without recourse to parallel transport?

The intrinsic curvature of a 2d sphere is measured (as far as I can tell) by the means of its tangent planes that lie in the 3d...

Very pleased if that is the case as I have been trying to understand this concept for the last 10 years. I wonder if I can now try...

If the turret of the tank is attached to the body by a mount that uses 100% non friction ball bearings ** and we send the tank around...

In this video I can see a person walking around lines of curvature on a sphere with an arrow strapped to his waist. His task is to...

Thanks very much for those answers So a tool it is but non orthogonal axes do occur in real applications.(the crystals seem obvious now...

Suppose ,instead of the usual x,y coordinate system with an I basis vector along the x -axis and a corresponding j basis vector along...