Eltable(S, Im)ΒΆ

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An eltable over domains D and I is a structure which can be viewed as a function from D to I. Examples of eltable structures range from data structures, e.g. those of type List, to algebraic structures, e.g. Polynomial.

elt: (%, S) -> Im
elt(u, i) (also written: u . i) returns the element of u indexed by i. Error: if i is not an index of u.