Concepts inReference reconciliation in complex information spaces
Value (computer science)
In computer science, a value is an expression which cannot be evaluated any further. The members of a type are the values of that type. For example, the expression "1 + 2" is not a value as it can be reduced to the expression "3". This expression cannot be reduced any further (and is a member of the type Nat) and therefore is a value. The "value of a variable" is given by the corresponding mapping in the environment.
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Prime number
A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. A natural number greater than 1 that is not a prime number is called a composite number. For example, 5 is prime, as only 1 and 5 divide it, whereas 6 is composite, since it has the divisors 2 and 3 in addition to 1 and 6.
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Personal information management
Personal information management (PIM) refers to the practice and the study of the activities people perform in order to acquire, organize, maintain, retrieve and use information items such as documents (paper-based and digital), web pages and email messages for everyday use to complete tasks (work-related or not) and fulfill a person¿s various roles (as parent, employee, friend, member of community, etc.).
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Precision and recall
In this figure the relevant items are to the left of the straight line while the retrieved items are within the oval. The red regions represent errors. On the left these are the relevant items not retrieved, while on the right they are the retrieved items that are not relevant. Precision and recall are the quotient of the left green region by respectively the oval (horizontal arrow) and the left region (diagonal arrow).
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