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ArrBettiNumbers    --    Betti numbers of an arrangement of hyperplanes

Syntax

ArrBettiNumbers(A: LIST): LIST

Description

This function returns the list [b_0,b_1,...,b_l] of the Betti numbers from the list A of hyperplanes in the arrangement.

Example

/**/ use QQ[x,y]; /**/ A := [x, x-y, y]; /**/ ArrBettiNumbers(A); [1, 3, 2]

See Also