By Pavel Etingof; Vladimir Retakh; I M Singer

ISBN-10: 0817644679

ISBN-13: 9780817644673

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**Extra info for The Unity of Mathematics**

**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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