Explain what the Python function \texttt{maxSp} defined by:
\begin{verbatim}
def maxSp(Q:np.ndarray, k:int, t:float) -> float:
n = Q.shape[1]
E = np.exp(t * np.array(range(n)))
A = Q * E
B = puiss2k(A, k)
C = np.dot(A, B)
return C.trace() / B.trace()
\end{verbatim}
does.