olemus
(2a) matemaatikas:
funktsioon c mingi hulga S kõigi alamhulkade hulgast
iseendasse, nii et mis tahes alamhulkade X ja Y korral:
i) hulk X on hulga c(X) alamhulk
ii) kui X on Y alamhulk, siis c(X) on hulga c(Y) alamhulk
iii) c(c(X)) = c(X)
näide:
lineaarse katte moodustus
Wiktionary:
5. (mathematics) the smallest set that both includes a given subset and possesses some given property
https://www.mathsisfun.com/sets/closure.html
https://mathworld.wolfram.com/Closure.html
https://en.wikipedia.org/wiki/Closure_(mathematics)
https://en.wikipedia.org/wiki/Closure_(topology)

(2b) programmikeeltes:
kirje, milles on funktsioon
koos ta vabu muutujaid siduva keskkonnaga
Wiktionary:
4. (programming) an abstraction that represents a function within an environment, a context consisting of the variables that are both bound at a particular time during the execution of the program and that are within the function's scope
http://c2.com/cgi/wiki?WhatIsClosure
https://en.wikipedia.org/wiki/Closure_(computer_programming)
https://www.youtube.com/watch?v=yiEeiMN2Khs

vt ka
- algebraline sulund
- sulundioperaator
- sulundiruum