ISBN-13: 9783659864025 / Angielski / Miękka / 2016 / 88 str.
In this book we introduce eight types of bitopological groups each of which depending on the notions of ij-_-open sets and ij-_-continuous functions. This book introduces the notion of bitopological subgroups and investigating some cases where an algebric subgroup becomes a bitopological subgroup. In this book we construct a new bitopological group from old one using the notion of quotient spaces of the first type.