Hi Philippe,
There isn't any way to do this properly right now.
We can't use inequalities like `x < X` but we can say that X = x+delta
where delta is positive:
```
In [3]: x, X = symbols('x X', real=True)
In [4]: e = Min(x, X)
In [5]: e
Out[5]: Min(X, x)
In [6]: delta = Symbol('delta',
Dear All,
I cannot figure out how to impose a condition. I have a function that is
defined as a piecewise function. When it returns its results with several
Min(x,y). I would like to substitute Min(x,X) with "x" since
