Iranian Mathematical Society (IMS) Bulletin of the Iranian Mathematical Society 1017-060X 37 No. 4 2011 12 15 Connections between C(X) and C(Y), where Y is a subspace of X109 126 en A. Aliabad M. Badie 2009 11 29 $z$-filter prime $z$-ideal prime $z^circ$-ideal $P$-space quasi $P$-space $F$-space $CC$-space $G_delta$-point