Instead of constantly checking whether a single letter name being inside the set
(x y u v m n) or not, I think it will more convenient to use 2-letter names
instead, such as: aa bb cc xx yy. It is easy to type.
J. Patrick Harrington wrote:
I think the replacement of x. by x, etc. is an idea "too clever
by half". It's only broken some of my code in minor ways but will be a
persistent irritant. x,y,z,u,v,w are the first variable names
I tend to use & now you have to think twice before using them.
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