\item \self 
Let $a$ and $b$ be Boolean variables.
Complete the python code with the appropriate variable declarations and constraint statements to check whether the following equivalence holds:
$$\lnot (a \lor b) \equiv (\lnot a \land \lnot b).$$ 

  \vskip1em

  \begin{pythonSourceCode}
    from z3 import *

    solver = Solver()






    result = solver.check()
    print(result)
  \end{pythonSourceCode}