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QA612.7.SPR FCT 81685 Simplicial homotopy theory QA612.7.SPR FCT 81713 Homotopy theory of C* QA612.7.SPR FCT 82535 Stein manifolds and holomorphic mappings QA612.7.SPR FCT 82773 Stable homotopy around the Arf-Kervaire invariant QA613 | QA316.SPR FCT 82109 Variational inequalities and frictional contact problems QA613 | QA613. FCT 95775 An introduction to manifolds QA613 | QA613. FCT 96142 Diffeomorphisms of elliptic 3-manifolds

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Were I to take an iron gun, And ?re it o? towards the sun; I grant ‘twould reach its mark at last, But not till many years had passed. But should that bullet change its force, And to the planets take its course, ‘Twould never reach the nearest star, Because it is so very far. from FACTS by Lewis Carroll [55] Let me begin by describing the two purposes which prompted me to write this monograph. This is a book about algebraic topology and more especially about homotopy theory. Since the inception of algebraic topology [217] the study of homotopy classes of continuous maps between spheres has enjoyed a very exc- n n tional, central role. As is well known, for homotopy classes of maps f : S ?? S with n? 1 the sole homotopy invariant is the degree, which characterises the homotopy class completely. The search for a continuous map between spheres of di?erent dimensions and not homotopic to the constant map had to wait for its resolution until the remarkable paper of Heinz Hopf [111]. In retrospect, ?nding 3 an example was rather easy because there is a canonical quotient map from S to 3 1 1 2 theorbitspaceofthe freecircleactionS /S =CP = S .

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