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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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closed as unclear what you're asking by rhermans, Henrik Schumacher, eyorble, m_goldberg, Szabolcs Sep 3 '18 at 6:51

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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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 '18 at 10:26

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