This type represents elements in Ext-algebras. Each object of type ExtAlgebra is itself a type E, and homogeneous elements in E belong also to the type ExtElement, which is the parent of E. Internally an element of type ExtElement is of type BasicList consisting of two basic lists, the first is a list of coefficients and the second is a list of indices for the generators occurring in the element.
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The object ExtElement is a type, with ancestor classes BasicList < Thing.