Solución:
Espero que el siguiente código te ayude …
documentclass{book}
begin{document}
[
overline{S}^{2}_{n}
]
[
overline{S_{n}}^{2}
]
[
bar{S_{n}}^{2}
]
end{document}
Producción
Usando el código de Hendrik Vogt en su respuesta a esta pregunta, tiene una widebar comando que tiene en cuenta el ángulo en cursiva del glifo:
documentclass{article}
usepackage[utf8]{inputenc}%
usepackage{mathtools, nccmath}
makeatletter
let[email protected]mathaccent
newcommand*[email protected][3]{%
setbox0hbox{${mathaccent"0362{#1}}^H$}%
setbox2hbox{${mathaccent"0362{kern0pt#1}}^H$}%
ifdimht0=ht2 #3else #2fi
}
%The bar will be moved to the right by a half of [email protected], which is computed by amsmath:
newcommand*[email protected][1]{kern#1dimexpr[email protected]}
%If there's a superscript following the bar, then no negative kern may follow the bar;
%an additional {} makes sure that the superscript is high enough in this case:
DeclareRobustCommandwidebar[1]{@ifnextchar^{{[email protected]{#1}{0}}}{[email protected]{#1}{1}}}
%Use a separate algorithm for single symbols:
newcommand*[email protected][2]{[email protected]{#1}{[email protected]@{#1}{#2}{1}}{[email protected]@{#1}{#2}{2}}}
newcommand*[email protected]@[3]{%
begingroup
defmathaccent##1##2{%
%Enable nesting of accents:
letmathaccent[email protected]
%If there's more than a single symbol, use the first character instead (see below):
if#32 let[email protected][email protected] fi
%Determine the italic correction:
setbox[email protected]hbox{$[email protected]{[email protected]}_{}$}%
setbox[email protected]hbox{$[email protected]{[email protected]}{}_{}$}%
[email protected]wd[email protected]
advance[email protected]wd[email protected]
%Now [email protected] is the italic correction of the symbol.
divide[email protected] 3
@tempdimawd[email protected]
advance@tempdima-scriptspace
%Now @tempdima is the width of the symbol.
divide@tempdima 10
advance[email protected]@tempdima
%Now [email protected] = (italic correction / 3) - (Breite / 10)
ifdim[email protected]>[email protected] [email protected]fi
%The bar will be shortened in the case [email protected]<0 !
[email protected]{0.6}kern-[email protected]
if#31
overline{[email protected]{-0.6}kern[email protected][email protected][email protected]{0.4}kern[email protected]}%
advance[email protected]dimexpr[email protected]
%Place the combined final kern (-[email protected]) if it is >0 or if a superscript follows:
let[email protected]#2%
ifdim[email protected]<[email protected] let[email protected]fi
if[email protected] kern-[email protected]fi
else
overline{[email protected]{-0.6}kern[email protected]#1}%
fi
}%
[email protected]@ne
let[email protected]@empty let[email protected][email protected]@skewchar
mathsurround[email protected] [email protected]{mathgroup[email protected]relax}%
[email protected]@skewcharrelax
letmathaccentV[email protected]@a
%The following initialises [email protected] and calls mathaccent:
if#31
[email protected]@arelax111{#1}%
else
%If the argument consists of more than one symbol, and if the first token is
%a letter, use that letter for the computations:
def[email protected]@marker##1endmarker{}%
futurelet[email protected][email protected]@marker#1endmarker
ifcatnoexpand[email protected] Aelse
def[email protected]{}%
fi
[email protected]@arelax111{[email protected]}%
fi
endgroup
}
makeatother
begin{document}
[ widebar{S}_n^2 = mfrac{1}{n}sum_{i=1}^{n}(X_{i} - M_{n})^{2} ]%
end{document}
yo diría
documentclass[]{article}
begin{document}
$$overline{S}_n^2 = frac{1}{n}sumlimits_{i=1}^{n}(X_i - M_n)^2$$
end{document}
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