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MathML Test : Invisible Operators

This test allows to check the behavior of a software with the three Invisible Operators. For each of them, an example is given with and without the operator.

1. no character have to be displayed
2. for softwares with a non-visual rendering, check the difference with or without invisible operators.

• ApplyFunction : $f\left(x\right)$and $f\left(x\right)$
• InvisibleTimes : $xy$ and $xy$
• InvisibleComma : $a_{ij}$and $a_{ij}$