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## A* algorithm

A member of the class of best-first heuristic search techniques that attempt to find a “best” path from a given start node to a designated goal node in a problem graph. An evaluation function is used ...

## Aalen model

A linear regression model describing the manner in which the expected value of a response variable, Z(t), depends on explanatory variables X1(t),…, Xk(t) with time-dependent coefficients β0(t), ...

## Abandonment

A term used to describe the user of the Internet who stops some process they are involved in and does not return to it. For example a user who has purchased some items, partially filled their ...

## abelian group

Suppose that G is a group with the operation ￮. Then G is abelian if the operation ￮ is commutative; that is, if, for all elements a and b in G, a ￮ b=b ￮ a.

## Abel's test

A test for the convergence of an infinite series which states that if ∑a n is a convergent sequence, and {b n} is monotically decreasing, i.e. b n+1≤b n for all n, then ∑a n b n is also convergent.

## ABEND

Acronym for ABnormal END of task. Normally this occurs when a computer crashes or a communication link fails.

## ablative

Designating an optical recording technique in which the heat generated by the recording beam melts or vaporizes a small area of the recording medium, leaving the underlying layer (with a different ...

## abnormal termination

A termination to a process brought about by the operating system when the process reaches a point from which it cannot continue, e.g. when the process attempts to obey an undefined instruction. In ...