Download Dpi - property and normal subgroups by Gilotti A. L. PDF

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By Gilotti A. L.

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This encodes the data of the set U = {z1 = z2 = z3 = 0}. When we take C3 \ U, the scaling action has no fixed points, and we can safely quotient by C∗ . The resulting smooth variety is, of course, P2 . 2. PROJECTIVE SPACES A 29 B D C Figure 1. Four toric fans. A) The fan describ2 ing P , consisting of three cones between three vectors: (1, 0), (0, 1), (−1, −1). B) P1 , described by two onedimensional cones (vectors): 1 and −1. C) P1 × P1 . D) The Hirzebruch surface Fn = P(OÈ1 ⊕OÈ1 (n)); the southwest vector is (−1, −n).

As another example, consider diagram (D) from Fig. 1, with v4 (the downward pointing vector) and the two cones containing it removed. , v1 + v2 + nv3 = 0. To construct the corresponding toric variety, we start with C3 and remove U = {z1 = z2 = 0} (as v1 and v2 do not share a cone), and quotient by C∗ acting as λ : (z1 , z2 , z3 ) → (λ1 z1 , λ1 z2 , λn z3 ). Define Z to be the resulting space Z = (C3 \ U )/C∗ . Let us now rename the coordinates X0 ≡ z1 ; X1 ≡ z2 ; θ ≡ z3 . We can cover Z with two patches U = {X0 = 0} and V = {X1 = 0}.

We can see that Fn resembles P1 × P1 , except the second P1 intermingles with the first. In fact, Fn is a fibration of P1 over 30 2. ALGEBRAIC GEOMETRY P1 , trivial when n = 0. We will return to explaining the caption in later sections. ) Another interesting example (not pictured) is to take the diagram from (A) and shift it one unit from the origin in R3 . That is, take v1 = (1, 1, 0), v2 = (1, 0, 1), v3 = (1, −1, −1), and v0 = (1, 0, 0) (the origin becomes a vector after the shift). The single relation among these four vectors is (−3, 1, 1, 1).

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