Math what are the open connected sets in R^n(n>2) are homeomorphic to R^n? [on hold] By admin October 24, 2016 October 24, 2016 I know that any starshaped domain is homeomorphic to R^n.But I asking more open sets which are homeo. ================= ================= ================= How its derivate this function? Fundamental group of a space with no one cell?