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In this book, author has highlighted recent work on closed, absolutely closed, saturated and supersaturated properties of different classes of regular semigroups. He also verified these properties on some other identities of semigroups. In proving the results author effectively used celebrated Isbell's Zigzag Theorem. He also provided the different and short way to prove the Isbell's Zigzag Theorem for commutative semigroups.
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