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ConformalBlocks :: standard basis

standard basis -- The standard basis of symmetric divisors for the moduli space of stable n-pointed genus zero curves

The standard basis of the Q-vector space of Sn symmetric divisors on M0,n is given by the boundary divisors Bi, as we now explain. Let ΔI be the closure of the locus of curves with two irreducible components meeting at one node such that the marked points with labels in I lie on the first component, and the marked points with labels in Ic lie on the second component. Then Bi= ∑#I=i ΔI, and the divisors B2, ..., B[n/2] form a basis of the space of symmetric divisors. See [KM].