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MathML Test : Operator, Fence, Separator or Accent

Invisible operators - Special operators

See the section Operator Dictionnary to test these symbols.

Detailed rendering rules for mo elements

$a{+}_{4}b$

Stretching of operators, fences and accents

Vertical Stretching Rules

A stretchy operator should vertically stretch in the following cases :

• as a direct sub-expression of an mrow element : $\begin{array}{c}1\\ 2\\ 3\end{array}\nearrow \begin{array}{c}a\\ b\\ c\end{array}$
• as the sole direct sub-expression of an mtd element in some row of a table : $\begin{array}{ccc}\begin{array}{c}1\\ 2\\ 3\end{array}& \nearrow & \begin{array}{c}a\\ b\\ c\end{array}\end{array}$

Horizontal Stretching Rules

A stretchy operator should horizontally stretch in the following cases :

• as a direct sub-expression of an munder, mover, or munderover :

  $\underset{\begin{array}{ccc}1& 2& 3\end{array}}{\nearrow }$ ; $\underset{\nearrow }{\begin{array}{ccc}1& 2& 3\end{array}}$ ; $\stackrel{\begin{array}{ccc}1& 2& 3\end{array}}{\nearrow }$ ; $\stackrel{\nearrow }{\begin{array}{ccc}1& 2& 3\end{array}}$ ; $\underset{\begin{array}{ccc}1& 2& 3\end{array}}{\overset{x}{\nearrow }}$ ; $\underset{\nearrow }{\overset{\begin{array}{ccc}1& 2& 3\end{array}}{x}}$ ; $\underset{x}{\overset{\nearrow }{\begin{array}{ccc}1& 2& 3\end{array}}}$

• the sole direct sub-expression of an mtd element in some column of a table : $\begin{array}{c}\begin{array}{ccc}1& 2& 3\end{array}\\ \nearrow \\ \begin{array}{ccc}a& b& c\end{array}\end{array}$

Other attributes of mo