Geodesic
R 1, Pairwise Compact, and Pairwise Complete Spaces
Canadian mathematical bulletin, Tome 15 (1972) no. 1, pp. 109-113

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The R 1 axiom was first introduced by Davis in [1]. It is strictly weaker than the T 2 axiom. Murdeshwar and Naimpally, in [4], have weakened the T 2 hypothesis to R1 in some well-known theorems. We show that in many topological spaces the R 1 axiom and regularity are equivalent. Also, the definition of local compactness given in [4] can be weakened to the usual definition and still get the same results.The notion of a bitopological space was first introduced by Kelley in [3]. Fletcher, Hoyle, and Patty discuss pairwise compactness for bitopological spaces in [2]. One of our main results is that a bitopological space (X, P, Q) is pairwise compact if and only if each ultrafilter v on X, containing a proper P closed set and a proper Q closed set, has a common P and Q limit. 
Richardson, G. D. R 1, Pairwise Compact, and Pairwise Complete Spaces. Canadian mathematical bulletin, Tome 15 (1972) no. 1, pp. 109-113. doi: 10.4153/CMB-1972-019-4
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