Package amsmath Warning: Unable to redefine Umathaccent hat.


Package amsmath Warning: Unable to redefine Umathaccent check.


Package amsmath Warning: Unable to redefine Umathaccent tilde.


Package amsmath Warning: Unable to redefine Umathaccent acute.


Package amsmath Warning: Unable to redefine Umathaccent grave.


Package amsmath Warning: Unable to redefine Umathaccent dot.


Package amsmath Warning: Unable to redefine Umathaccent ddot.


Package amsmath Warning: Unable to redefine Umathaccent breve.


Package amsmath Warning: Unable to redefine Umathaccent bar.


Package amsmath Warning: Unable to redefine Umathaccent vec.


Package amsmath Warning: Unable to redefine math accent mathring.

! Extended mathchar used as mathchar (4203026).
<to be read again>
                   relax
l.893 mathchardefstd@minusmathcode`-relax

usepackage{savesym}
usepackage{arsclassica}
savesymbol{dddot}
savesymbol{ddddot}
%usepackage[many]{tcolorbox}
%usepackage{xcolor}
%usepackage{varwidth}
%usepackage{environ}
%usepackage{xparse}

title{Quả cầu}
author{}
restoresymbol{TXF}{dddot}
restoresymbol{TXF}{ddddot}