W2, p estimates of the heat equation in (omega)(subset of)Rn and the restrictions on (partial)(omega)

This is an alternative approach of finding the W2, p estimates of the heat equation in a domain, (omega)(subset of)Rn. Methods used in (Acta Math. Sin. 2003; 19(2):381-396) are expanded to the case of a bounded domain. As a result, milder restrictions are applied to (partial)(omega)than previously required by using the classical singular integral approach