User:Boris Tsirelson/Sandbox1

= Case: general, special, degenerate, limiting =

Questions to be addressed:


 * Is 0 (a special case of) a number?
 * Is a point (a special case of) a set?
 * Is a scalar (a special case of) a vector?
 * Is a number (a special case of) a function?
 * Is a point (a special case of) a disk?
 * Is the empty set (a special case of) an ellipse?
 * Is a straight line (a special case of) a curve?
 * Is time (a special case of) space?
 * Is a linear equation (a special case of) quadratic equation?
 * Is the instantaneous velocity (a special case of) average velocity?
 * Is infinitesimal (a special case of) a number?
 * Is infinity (a special case of) a number?

= Miscellaneous questions (to be grouped somehow) =


 * Is a circle one-dimensional, two-dimensional or three-dimensional?