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In the study of algebraic/analytic varieties a key aspect is the description of the invariants of their singularities. This book targets the challenging non-isolated case. Let f be a complex analytic hypersurface germ in three variables whose zero set has a 1-dimensional singular locus. We develop an explicit procedure and algorithm that describe the boundary M of the Milnor fiber of f as an oriented plumbed 3-manifold. This method also provides the characteristic polynomial of the algebraic monodromy. We then determine the multiplicity system of the open book decomposition of M cut out by the argument of g for any complex analytic germ g such that the pair (f,g) is an ICIS. Moreover, the horizontal and vertical monodromies of the transversal type singularities associated with the singular locus of f and of the ICIS (f,g) are also described. The theory is supported by a substantial amount of examples, including homogeneous and composed singularities and suspensions. The properties peculiar to M are also emphasized

Algebraic topology --- Geometry --- Analytical spaces --- Mathematical analysis --- landmeetkunde --- topologie (wiskunde)

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Algebraic topology --- Geometry --- Analytical spaces --- Mathematical analysis --- landmeetkunde --- topologie (wiskunde)

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This text deals with A1-homotopy theory over a base field, i.e., with the natural homotopy theory associated to the category of smooth varieties over a field in which the affine line is imposed to be contractible. It is a natural sequel to the foundational paper on A1-homotopy theory written together with V. Voevodsky. Inspired by classical results in algebraic topology, we present new techniques, new results and applications related to the properties and computations of A1-homotopy sheaves, A1-homology sheaves, and sheaves with generalized transfers, as well as to algebraic vector bundles over affine smooth varieties.

Algebraic topology --- Homotopy theory --- Mathematics --- Physical Sciences & Mathematics --- Geometry --- Mathematical Theory --- Algebraic topology. --- Homotopy theory. --- Deformations, Continuous --- Mathematics. --- Algebraic geometry. --- K-theory. --- Algebraic Geometry. --- K-Theory. --- Algebraic Topology. --- Topology --- Homology theory --- Algebraic geometry --- Math --- Science --- Geometry, algebraic.

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This book is about modern algebraic geometry. The title A Royal Road to Algebraic Geometry is inspired by the famous anecdote about the king asking Euclid if there really existed no simpler way for learning geometry, than to read all of his work Elements. Euclid is said to have answered: There is no royal road to geometry!  The book starts by explaining this enigmatic answer, the aim of the book being to argue that indeed, in some sense there is a royal road to algebraic geometry. From a point of departure in algebraic curves, the exposition moves on to the present shape of the field, culminating with Alexander Grothendieck's theory of schemes. Contemporary homological tools are explained. The reader will follow a directed path leading up to the main elements of modern algebraic geometry. When the road is completed, the reader is empowered to start navigating in this immense field, and to open up the door to a wonderful field of research. The greatest scientific experience of a lifetime!

Category theory. Homological algebra --- Ordered algebraic structures --- Algebra --- Algebraic topology --- Geometry --- algebra --- landmeetkunde --- topologie (wiskunde) --- geometrie

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Algebra --- Differential geometry. Global analysis --- Algebraic topology --- Topological groups. Lie groups --- algebra --- topologie (wiskunde) --- differentiaal geometrie