CONTENTS Preface v Introduction vi i Chapter I . Loo p theorem-sphere theorem : Th e Towe r Constructio n 1 Chapter II . Connecte d sum s 1 8 Chapter III . 2-manifold s embedde d i n 3-manifold s 3 0 Chapter IV . Hierarchie s 5 1 Chapter V . Three-manifol d group s 6 5 Chapter VI . Seifer t fibere d manifold s 8 3 Chapter VII . Periphera l structur e 10 9 Chapter VIII . Essentia l homotopies (Th e annulus-toru s theorems ) 13 0 Chapter IX . Characteristi c Seifer t pair s 15 9 Chapter X . Deformin g homotop y equivalence s 19 5 Bibliography 24 4 Index 25 0 in
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