Hi everyone,

With the command \definemathfence it is possible to define for instance the 
following command

        \definemathfence[duality][angle][command=yes,factor=auto]

so that $\duality{T,\phi}$ results in $\langle T,\phi \rangle$ and the \langle 
and \rangle are appropriately scaled when necessary.
How can one create a command called \bracparenth in order to get a left bracket 
on the left and a right parenthesis on the right, that is

        $\bracparenth{a,b} = [a,b)$

and so that when necessary it scales automatically.

Below is the example for \duality.

Thanks in advance: OK

%%% begin mathfence-example.tex
\definemathfence[duality][angle][command=yes,factor=auto]
\definemathfence[parenth][parenthesis][command=yes,factor=auto]

\starttext

The action of $T$ on a smooth function $\phi$ is denoted by 
\startformula
\duality{T,\phi}
\stopformula
while the scalar product of two functions $f$ and $g$ is denoted 
$\parenth{f|g}$.

\stoptext
%%% end mathfence-example.tex
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