“…Several papers on the topic showing the diversity of cases studied are [14,15,16,17,18,19,20,21], see also [12,22]. Speed of convergence of Chernoff approximations were studied in [23,13,8,9,7]. It is also interesting to compare an approach to Feynman-Kac formula without Chernoff approximations [6] with the way of obtaining Feynman-Kac formulas as a corollary of Feynman formulas which were proven with the use of the Chernoff theorem [2].…”