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

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

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).
References in periodicals archive ?
Closure of peritoneum may result in more pain because of ischemia produced by suturing with increased adhesion formation during regeration8.
According to the report, plastic closures (49 percent) overtook metal closures (48 percent) last year, gaining the largest share of the global market for beverage closures.
Closure of the nasal vestibule in atrophic rhinitis--a new non-surgical technique.
Weyerhaeuser also announced the permanent closures of two Canadian paper machines, which, it says, will result in a pretax charge of US$ 380 million to US$ 385 million in the fourth quarter.
Hook-and-pile sleeve cuff closures which provide positive closure for all sizes
As earlier studies had, these two tests relied on information that patients provided after PFO closure.
From January, 2002 through July, 2003, I got 54 "hits" on "seeking closure.
Additionally we will gain the additional benefit of a more efficient use of our resources by converting the long closure process into an event.
Prior to a closure or change-in-service, an owner or operator must conduct a site assessment to measure for the presence of a release where contamination would be most likely.
However, the issue is determining what falls under the scope of the exposure draft; I believe it's still unclear what type of closure obligations will be covered.
The hand drawings were re-created as CAD drawings depicting the sheet metal body, the, sheet metal door and the seal itself After that, it was necessary to find the right combination of materials so the seal would meet customer's specification for closure force and contact pressure.
Three approaches to assessing the potential impacts of closure on access to care have been identified.