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', positive=True)
In [7]: e.subs(X, x+delta)
Out[7]: x
```
There is also the direct approach:
```
In [8]: e.subs(Min(x, X), x)
Out[8]: x
```
--
Oscar
On Mon, 23 Mar 2020 at 15:36, Philippe Piot <philippe.p...@gmail.com> wrote:
>
> 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 x<X. I have
> tried something like (here simplified as my function output as several terms).
> with assuming (x<X):
> print (Min(x,X))
> but it does not work [i.e. it does not simplify Min(x,X) with x]. Thanks for
> any suggestions.
> Best, -- Philippe.
>
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