disjoint union

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disjoint union

In domain theory, a union (or sum) which results in a domain without a least element.
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The product of a matrix by a vector or by a matrix is obtained by the classical formulas in sums of products forms, sums being interpreted as disjoint unions and products as cartesian products, themselves obtained by grafting at a bud following Eq.
greater than or equal to] k] is the disjoint union of [SEQ.
2]) [union] {(u, v) [member of] V(G): u [member of] C(i), [upsilon] [member of] C(j)}, which connects in the disjoint union all vertices in C(i) with all vertices in C(j).
However, the two are interdefinable with the help of disjoint union.