i need to solve a system of ecuations with a generic function e.g V(q). i know that dif(V(q),q) is possitive and second derivative is negative. how can i incorporate this information?

q is my desition variable

hola

I need define a same equation with different parametric settings

gracias

I need to refer to all after "and" in the solution of inequalities system

I refer to a specific solution using the label. I get two equations after using solve, and I want to introduce them in another system to solve applied again.