  An alternative method is proposed for deriving the time dependent
Schroedinger equation from the pictures of wave and matrix mechanics. The
derivation is of a mixed classical quantum character, since time is treated as
a classical variable, thus avoiding any controversy over its meaning in quantum
mechanics. The derivation method proposed in this paper requires no ad hoc
assumption and avoids going through a second-order differential equation that
can be reduced to the well known time-dependent Schroedinger equation only
postulating a complex wavefunction with an exponential time dependence, as did
by Schroedinger in its original paper of 1926.
