\, - used to create thin space.
\: - used to create medium space.
\> - used to create alternate medium space.
\; - used to create thick space.
{ letter1 operator letter2}
\, is used to create thin space.
\: is used to create medium space.
\> is used to create alternate medium space.
\; is used to create thick space.
normal spacing between letters:
$ abababab $
using \, between letters:
$ a\,b\,a\,b\,a\,b\,a\,b $
using \: between letters:
$ a\:b\:a\:b\:a\:b\:a\:b $
using \> between letters:
$ a\>b\>a\>b\>a\>b\>a\>b $
using \; between letters:
$ a\;b\;a\;b\;a\;b\;a\;b $