[math-fun] readability of math-fun posts

--If you stick to plain ASCII character set, then you are safe. If you use anything else, then some people will have trouble reading it. Sure, we may be able to compensate if we try hard enough, but I think a post for a general, cross-platform audience, ought to be designed so Ignorant Joe Schmoe can read it. Another thing some posters enjoy doing is making a fairly long message which is all on one single line, say 1000 characters long. Again, some reader tools insert line breaks to make that readable. Others do not.