#### math spaces

List of predefined spaces:

 Math Spaces Command Example Result \, (smallest predefined) $$a\,ba\,b$$ \:  (second smallest predefined) $$a\:ba\:b$$ \;  (third smallest predefined) $$a\;ba\;b\/ (avoiding ligatures)V\/A instead of$$VAV\/A$instead of$VA$$\quad (space of current character set size)$$a\quad~ba\quad~b$$\qquad (double space of current character set size)$$a\qquad~ba\qquad~b\_ (where _ is blank!)a\ b$(whereas $$a\bis not a valid filter expression since the blank space is missing; it is recommended to use the tilde ~ instead of the simple whitespace)a\ b\hspace{n} ,where n positive integer (= n Pixels)a~\hspace{30}~b$$$a~\hspace{15}~b$a~\hspace{2}~b$$a~\hspace{1}~ba~\hspace{30}~b$$a~\hspace{15}~b$$a~\hspace{2}~b$$a~\hspace{1}~b\unitlength{m}\hspace{n}, changes the default unit length (m=1px) to be applieda~\hspace{2}~b\unitlength{10}~\hspace{2}~c$(second space is 10x2=20px) $a~\hspace{2}~b\unitlength{10}~\hspace{2}~c$

Note: Simple blank spaces and tildes (~) are ignored by the TeX filter and don't produce any space. You must use one of the defined math spaces to get a visible (extra) space.