How to define a function with subscripted variable? I want to write the following expression $$f[a_9] =1+ a_7 + a_9$$
I tried to write "f[Subscript[a, 9]_ ] := 1+ [Subscript[a, 7]+ [Subscript[a, 9]" but it doesn't work
2026-03-26 03:09:43.1774494583
How to define a function with subscripted variable in Mathematica?
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See https://mathematica.stackexchange.com/search?q=subscript+variable.
I wasn't able to find a straight answer there or make it work myself; it sounds like subscripting is suboptimal for this purpose. There are lots of workarounds you could do where you render it to appear as a subscript after the fact (maybe with $PrePrint), depending on what exactly you're trying to accomplish.