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Table 2 The EM operators

From: The Sequence Ontology: a tool for the unification of genome annotations

EM operation

Definition

Overlap (x â—‹ y)

x and y overlap if they have a part in common.

Disjoint (x ι y)

x and y are disjoint if they share no parts in common.

Binary product (x . y)

The parts that x and y share in common.

Difference (x - y)

The largest portion of x which has no part in common with y.

Binary sum (x + y)

The set consisting of individuals x and y.

  1. In each case x and y refer to two wholes. The first two operators are Boolean and pertain to whether two wholes share any parts in common; whereas the remainder return either the parts, or, in the case of binary sum, the wholes, that satisfy the operation.