LaTeX provides a variety of commands for producing accented letters in math. These are different from accents in normal text (see Accents).
\acute
Math acute accent
\bar
Math bar-over accent
\breve
Math breve accent
\check
Math háček (check) accent
\ddot
Math dieresis accent
\dot
Math dot accent
\grave
Math grave accent
\hat
Math hat (circumflex) accent
\mathring
Math ring accent
\tilde
Math tilde accent
\vec
Math vector symbol
\widehat
Math wide hat accent
\widetilde
Math wide tilde accent
When you are putting an accent on an i or a j, the tradition is to use one without a dot, \imath
or jmath
(see Math symbols).
© 2007–2018 Karl Berry
Public Domain Software
http://latexref.xyz/Math-accents.html