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Mathematica

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    $\begingroup$ Strings don't have subscripts in them, so if you have something that looks like a string with a subscript that is just the front end displaying the string nicely but not showing the actual contents of the string. Try ToString[<<your string here>>, InputForm] to see what it really looks like. $\endgroup$ Commented Apr 2, 2024 at 20:33
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    $\begingroup$ @JasonB. It seems the "Uniconize" button in the iconized string is mis-parsing the string. The uniconized string has a syntax error. $\endgroup$ Commented Apr 2, 2024 at 20:39
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    $\begingroup$ I guess I should point out that the outputs of uniconizing and MakeBoxes are different. So I don't think it's a MakeBoxes problem. Maybe. $\endgroup$ Commented Apr 2, 2024 at 20:49
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    $\begingroup$ @JasonB. It's Mathematica that tells me there is a syntax error. No thought required: i.sstatic.net/QtfgZ.png -- A look at the box structure (Show Expression) shows it has a different structure than the input string: i.sstatic.net/2rkIx.png $\endgroup$ Commented Apr 3, 2024 at 1:49
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    $\begingroup$ The problem is that the un-iconized output is a string, not an expression. "\"\\!\\(\\*SubscriptBox[\\(a\\), \\(b\\)]\\)\"" // ToExpression will evaluate the expression. $\endgroup$ Commented Apr 3, 2024 at 8:05