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The following:

TemplateBox[{"a", "b"}, "Binomial"] // RawBoxes

yields the correctly formatted (2d box structure) of Binomial[a,b]:

$$\begin{pmatrix}a\\b\end{pmatrix}$$

But I would like to see its (and other built-in functions') explicit definition in terms of low level boxes. Presumably, the definition of the style "Binomial" lives somewhere. Where is it?

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1 Answer 1

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They live in stylesheets:

CurrentValue[{StyleDefinitions, "Binomial"}]
{TemplateBoxOptions -> {DisplayFunction -> (RowBox[{"(", 
    GridBox[{{#1}, {#2}}], ")"}] &), Tooltip -> Automatic}} 
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