Links to notes inside latex formulas

Is it possible to make links right from latex formulas? For example I have one big theorem or equation and there are many little elements inside it, such as greek letters or small expressions, and I want to link this elements to appropriate notes, where I have definitions of that small elements or an explanations, how this expression appeared there and why.
So it is a kind of breakdown of an equation, and when I will point with my mouse on different parts of it, i will see definitions and explanations.

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This is very unlikely to happen.