closure

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closure

1. Politics (in a deliberative body) a procedure by which debate may be halted and an immediate vote taken
2. Geology the vertical distance between the crest of an anticline and the lowest contour that surrounds it
3. Logic the closed sentence formed from a given open sentence by prefixing universal or existential quantifiers to bind all its free variables
4. Maths the smallest closed set containing a given set
5. Psychol the tendency, first noted by Gestalt psychologists, to see an incomplete figure like a circle with a gap in it as more complete than it is
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

closure

[′klō·zhər]
(civil engineering)
(geology)
The vertical distance between the highest and lowest point on an anticline which is enclosed by contour lines.
(mathematics)
The union of a set and its cluster points; the smallest closed set containing the set.
Property of a mathematical set such that a specified mathematical operation that is applied to elements of the set produces only elements of the same set
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

closure

(programming)
In a reduction system, a closure is a data structure that holds an expression and an environment of variable bindings in which that expression is to be evaluated. The variables may be local or global. Closures are used to represent unevaluated expressions when implementing functional programming languages with lazy evaluation. In a real implementation, both expression and environment are represented by pointers.

A suspension is a closure which includes a flag to say whether or not it has been evaluated. The term "thunk" has come to be synonymous with "closure" but originated outside functional programming.

closure

(theory)
In domain theory, given a partially ordered set, D and a subset, X of D, the upward closure of X in D is the union over all x in X of the sets of all d in D such that x <= d. Thus the upward closure of X in D contains the elements of X and any greater element of D. A set is "upward closed" if it is the same as its upward closure, i.e. any d greater than an element is also an element. The downward closure (or "left closure") is similar but with d <= x. A downward closed set is one for which any d less than an element is also an element.

("<=" is written in LaTeX as \subseteq and the upward closure of X in D is written \uparrow_\D X).
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
References in periodicals archive ?
Group A underwent primary closure and group B underwent delayed primary closure. All procedures were done under general anesthesia in both groups by researcher himself.
While in Group B rectus muscles closed with prolene1 and skin and subcutaneous tissue left open with saline-soaked gauze dressings for delayed primary closure (DPC) on the 3rd postoperative day or later if the incision conditions were inappropriate for closure.
Delayed primary closure (DPC, closure of wound margins after three days of surgery) and primary closure (PC, closure of the wound margins at the time of surgery) are two commonly used methods.
While some studies associate DPC with lower rates of SSI (42.5 % in primary closure versus 2.7% in delayed primary closure)6-8, some show that PC has low SSI rates ( 9.1% in PC group versus 27.3% in DPC group)4,9.
Most common being the delayed primary closure or coverage in accordance with the current recommendations.
Clinical and patient benefits may include assistance in managing the open abdomen, protection of the abdominal contents, and delayed primary closure. KCI

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