\~ | Math Notation Help

In order to prevent some browser specific problems with whitespaces, it is advisable to use ~ (tilde) as the whitespace instead of the normal blank key (in places where whitespaces are mandatory, e.g. after commands).
Ex.: $$$\frac~xy$$$ to produce $$\frac~xy$$
Ex.: $$$\sqrt~n$$$ to produce $$\sqrt~n$$