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I want to apply TreeForm to some expressions of the form m[m[m[y[1], y[1]], x[1]], z], but I want Mathematica to treat expressions of the form x[i] or y[i] as atoms. For instance,

TreeForm[m[m[m[y[1], y[1]], x[1]], z]]

outputs

Output tree

but I would like the leaves to be y[1], y[1], x[1] and z. How can I do this?

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Since strings are atomic and are displayed as themselves in a tree, we can just replace the terms with their string counterparts.

TreeForm[m[m[m[y[1], y[1]], x[1]], z] /. pat : _x | _y :> ToString@pat]

enter image description here

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    $\begingroup$ Thanks! Worked like a charm. $\endgroup$
    – Fernando Martin
    Nov 28, 2019 at 21:37

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