Abstract. Of concern is the singular problem du/dt = au + (c/|x|2)iz + /((, x), tz(x,0) = u0(x), and its generalizations. Here c > 0, x G RN, t > 0, and/and t/0 are nonnegative and not both identically zero. There is a dimension dependent constant C (N) such that the problem has no solution for c> Ct(N). For c =S Ct(A/) necessary and sufficient conditions are found for / and u0 so that a nonnegative solution exists.
Abstract. Of concern is the singular problem du/dt = au + (c/|x|2)iz + /((, x), tz(x,0) = u0(x), and its generalizations. Here c > 0, x G RN, t > 0, and/and t/0 are nonnegative and not both identically zero. There is a dimension dependent constant C (N) such that the problem has no solution for c> Ct(N). For c =S Ct(A/) necessary and sufficient conditions are found for / and u0 so that a nonnegative solution exists.
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