ntly</i>: the obtained Hamiltonian at time <math>t+\delta t</math>
 may then be used to interpolate the Hamiltonian, and repeat the evolution
 algorithm with this new information. Whenever iterating the procedure does
 not change the solution wavefunctions, the cycle is stopped. In practice,
 in <tt>Octopus</tt> we perform a second-order extrapolation without a
 self-consistency check, except for the first two iterations, where obviously
 the extrapolation is not reliable.
<br><br>
 The proliferation of met