Ellipses, I see. Thank you, +Olivier Bonucci
Thinking of a bit of orbital dynamics modeling that I'd seen mentioned at G+ recently, I wonder if there could be a nice diagram tool developed in an archaic programming language called Lisp, namely onto CLIM? In my opinion, CLIM is a fairly geometry-oriented graphical toolkit. Tough it would seem to lack anything do well organized as Eclipse's Standard Widget Toolkit in Java human computer interface design, however I think that it may be well suitable for such an application – as perhaps for illustrating the geometry of telecommunications in space? (I understand, of course, that any more commercially renowned OOP language such as Java might be more popular, for such an application, however I think there's goodwill in the rudiments of CLIM, if not furthermore in the heritage of Common Lisp in space-related applications)
[heart] the convenient eBook on an affordable PC platform… I think it's a great keynote, towards studying math.
 at the Google, Chromebooks, for instance
 There may be a Schaumm's Outline for such a technical manner of math?