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ConTeXt has a nice structure called {{code|1=mathstackers}} in order moved to define new math commands in which some characters are stacked over another one. For more information refer to {{src|math-stc.mkiv}}. The two command {{code|1=\mathover[symbol]{}{}}} and {{code|\mathunder[symbol]{}{}}} are built and can be used directly. However one may define one's own commands. A typical example is when you want to put a small circle on top of a letter (as one would when defining the topological interior of a set…). To do so we define first a new stacker named here {{code|1=MySymbol}}, and then invoking that with {{code|1=\definemathover}} we define two new commands {{code|1=\interior}} and {{code|1=\mystarred}} which can be used in math mode. <texcode>\definemathstackers[MySymbol] [voffset=-.3\mathexheight, hoffset=\zeropoint, mathclass=ord, topoffset=.4\mathemwidth, % poor man's italic correction middlecommand=\mathematics] \definemathover[MySymbol][interior]["2218] %this a small circle\definemathover[MySymbol][mystarred]["2717] % this is an asterisk\starttext Here is the new command \type{\interior{K}}: $\interior{K}$. Compare this to \type{\mathring{K}}: $\mathring{K}$. Here is the new command \type{\mystarred{K}}: $\mystarred{K}$. Here are the built-in commands \type{\mathover} and \type{\mathunder}: $\mathover[symbol]{"2217}{A}$, % 2217 is an asterisk$\mathover[symbol]{"2218}{A}$, % 2218 is a circle$\mathover[symbol]{"2219}{A}$, % 2219 is a bullet$\mathunder[symbol]{"2217}{A}$,$\mathunder[symbol]{"2218}{A}$,$\mathunder[symbol]{"2219}{A}$. \stoptext<Math/texcode>When typeset in {{code|1=mkiv}} one can see that the command {{code|1=\interior{K}}} shows the letter K with a small circle above it. [[Category:Mathstackers]]
Replaced content with "moved to Math/stackers"
