Department of Science Education, Hacettepe University, Beytepe, 06532 Ankara, Turkey
Abstract: In this paper, bitopological counterparts of the cardinal functions Lindelof number, weak Lindelof number and spread are introduced and studied. Some basic relations between these functions and the functions in  are given.
Keywords: bi-Lindelof number, weak bi-Lindelof number, bispread, bi-quasi-uniform weight
Classification (MSC 1991): 54A25, 54E55
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