Let $U$ be the universal family over $M=\bar{M}_{0,n}$, let $\omega_{U/M}$ be the relative dualizing sheaf, and let $\sigma_i: M \rightarrow U$ be the sections defining the marked points. The divisors $\psi_i$ are defined by $\psi_i := \sigma_i^*(\omega_{U/M})$. We define the class $\Psi$ by $\Psi = \psi_1 + ... + \psi_n.$
i1 : psiDivisorM0nbar(14)
24 33 40 45 48 49
o1 = --*B + --*B + --*B + --*B + --*B + --*B
13 2 13 3 13 4 13 5 13 6 13 7
o1 : S_14-symmetric divisor on M-0-14-bar
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The object psiDivisorM0nbar is a method function.