# Restricting a variable to a (real) range

Hi. I'm solving a differential equation which depends on two parameters $c1$ and $c2$. They are both positive

```
assume(c1 > 0)
assume(c2 > 0)
```

but in order to solve the equation, `maxima`

ask me whether `c2-3`

is positive, negative or zero. With the condition

assume(c2 - 3 > 0)

the equation is solved; But imposing `c2 - 3 < 0`

triggers and inconsistency... I believe that it is due to the initial assumption.

**Question**

Is it possible to set a condition like `assume(0 < c2 < 3)`

?