exact solution of the Hamiltonian
dynamics we need to choose a step size governing how far we move each
time we evolve the system forward. That is, the <em>step size
controls the resolution of the sampler</em>.</p>
<p>Unfortunately, for particularly hard problems there are features of
the target distribution that are too small for this resolution.
Consequently the sampler misses those features and returns biased
estimates. Fortunately, this mismatch of scales manifests as
<em>divergences</em> which provide 