IDEA: clear a-z cmd

[compsystems]

The SOLVE in capital letters is not documented in the CATALOG HELP

Quote:solve
Returns a list of the solutions (real and complex) to a polynomial equation or a set of polynomial equations.

solve(Eq,[Var]) or
solve({Eq1, Eq2,…}, [Var]) or
solve(Eq, Var=Guess) or
solve(Eq, Var=Val1…Val2)

Quote:SOLVE
Solves an equation for one of its variables. Solves the equation En for the variable var, using the value of guess as the initial value for the value of the variable var. If En is an expression, then the value of the variable var that makes the expression equal to zero is returned.

SOLVE(En,var,guess)

This function also returns an integer that is indicative of the type of solution found, as follows:
0—an exact solution was found
1—an approximate solution was found
2—an extremum was found that is as close to a solution as possible
3—neither a solution, an approximation, nor an extremum was found

I do not understand the last part [0 - 3]

Update the examples of the first post, I think that THE DIFFERENT CASES should have a more detailed explanation by Bernard