# Questions tagged [variable]

Questions on the use or manipulation of Mathematica variables (i.e. names associated with a changeable value). Use [variable-definitions] or [assignment] for questions on variable context localization, or assignment.

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### Identify a condition among variables that satisfy an inequality

I have a symbolic function that produces the output a = (1 - e - mu/n) Log[(1 - e - mu/n)/(1 - mu/n)] + (e + mu/n) Log[((e + mu/n) n)/mu] If I substitute ...
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### A specific usage of "Solve" function [duplicate]

It is something from Simplifying polynomials with conditions on variables, that intend to minimize the number of variables. The problem is the usage of Solve". I know how to solve equations, ...
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### how to use subscripted variable such as a_i as the control of Manipulate?

I'd like to define a series of variables called $l_1$,$l_2$, etc., in Mathematica, using the "ctrl+_" shortcut. Moreover, I want to use these variables as the controls of a Manipulate[] ...
1 vote
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### How can I define a function with a variable with subscript?

I want to define a function in Mathematica: $$h(\tau_x)=\tau_x$$ $\tau_x$ has no special meaning. To be honest, it's totally OK if I use the function $h(x)=x$ to replace $h(\tau_x)=\tau_x$. It doesn't ...
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