Download e-book for iPad: Spaces of Kleinian Groups by Yair N. Minsky, Makoto Sakuma, Caroline Series

By Yair N. Minsky, Makoto Sakuma, Caroline Series

ISBN-10: 0521617979

ISBN-13: 9780521617970

The topic of Kleinian teams and hyperbolic 3-manifolds is at present present process explosively speedy improvement, the previous few years having visible the answer of many longstanding conjectures. This quantity includes vital expositions and unique paintings through a few of the major members on themes resembling topology and geometry of 3-manifolds, curve complexes, classical Ahlfors-Bers idea, computing device explorations and projective buildings. Researchers in those and similar components will locate a lot of curiosity right here from the explosion within the sector over contemporary years, together with very important and unique examine from top names within the box.

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Example text

Note that in the case of curves, the parameter a amounts to an integer, normalized to be the negative of deg(L). In the rest of this section we will study various properties and generalizations of the notion of a quasi-map introduced above. 2 Variant Assume for a moment that Y is integral. Observe that if σ = (L, κ) is an S-point of QMapsa (Y, P(E); E), there exists an open dense subset U ⊂ Y × S over which κ is a bundle map. Consider the (automatically closed) subfunctor of QMapsa (Y, P(E); E), corresponding to the condition that the resulting map U → P(E) factors through T ⊂ P(E).

The semigroup of pos coweights λ, which are ≥ 0 in this sense will be denoted g . + To a dominant weight λˇ ∈ ˇ g , one attaches the integrable g-module, denoted Vλˇ , with a fixed highest-weight vector vλˇ ∈ Vλˇ . For a pair of weights λˇ 1 , λˇ 2 ∈ ˇ + g, there is a canonical map Vλˇ 1 +λˇ 2 → Vλˇ 1 ⊗ Vλˇ 2 that sends vλˇ 1 +λˇ 2 to vλˇ 1 ⊗ vλˇ 2 . The Lie algebra g has a triangular decomposition g = n ⊕ h ⊕ n− (here n is a profinite-dimensional vector space), and we have standard Borel subalgebras b = n ⊕ h, b− = h ⊕ n− .

In the main body of the present paper the scheme Y will be a smooth algebraic curve, but for completeness in this section we will consider the general case. Note that in the case of curves, the parameter a amounts to an integer, normalized to be the negative of deg(L). In the rest of this section we will study various properties and generalizations of the notion of a quasi-map introduced above. 2 Variant Assume for a moment that Y is integral. Observe that if σ = (L, κ) is an S-point of QMapsa (Y, P(E); E), there exists an open dense subset U ⊂ Y × S over which κ is a bundle map.

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Spaces of Kleinian Groups by Yair N. Minsky, Makoto Sakuma, Caroline Series


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