  In this comment, I discuss a recent path-integral Monte Carlo calculation by
Pearson, Pang, and Chen (Phys. Rev. A 58, 4796 (1998)). For bosons with a small
hard-core interaction in a harmonic trap, the authors find a critical
temperature which does not change with respect to the non-interacting gas. The
calculation suffers from a serious discretization error of the many-particle
density matrix.
