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I am working with the matrices of the form $u = \begin{pmatrix}Y &y\\0 & Y\end{pmatrix}$, and I have an operator $a$ such that $au=\begin{pmatrix}Y & ay\\0 & Y\end{pmatrix}$. Since y can be any symbolic variable, I'd like to be able to append the symbol of the operator to the upper-right corner of the matrix.

How can I achieve this?

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    $\begingroup$ Can you clarify if you are trying to create $\LaTeX$ expressions or define a Mathematica operator. If the later, do you want a be both an operator over a matrix, but just a scalar multiplication if over a symbol? As it stands, it's not clear what you are asking and you risk that your question may be put on-hold. To avoid or revert the Hold you can edit your question to improve it and make it specific, well-structured and easy to understand. Learn about good questions here. $\endgroup$
    – rhermans
    Aug 31, 2018 at 10:26

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