Tasuta kohaletoimetamine tellimustele üle 29 €
  • check 10+ miljonit raamatut
  • check Uued tooted iga päev
  • check Meid usaldab üle 1 miljoni kliendi
  • check Hea hind ja allahindlused
  • check Tarne üle kogu Euroopa

Sigma-ring: Mathematics, Complement (Set Theory) -

inglise keel
2026-03-06
100,18 € 166,96 €

-40% koodiga BOOKS

Meie tarnija laos

Saadetis 15-21 tööpäeva jooksul

30-päevane tagastamisõigus

High Quality Content by WIKIPEDIA articles! In mathematics, a nonempty collection of sets mathcal{R} is called a ¿-ring (pronounced sigma-ring) if it is closed under countable union and relative complementation: 1. bigcup_{n=1}^{infty} A_{n} in mathcal{R} if A_{n} in mathcal{R} for all n in mathbb{N} 2. A - B in mathcal{R} if A, B in mathcal{R} From these two properties we immediately see that bigcap_{n=1}^ ... Täielik kirjeldus

Võib-olla meeldib sulle ka

Kirjeldus

High Quality Content by WIKIPEDIA articles! In mathematics, a nonempty collection of sets mathcal{R} is called a ¿-ring (pronounced sigma-ring) if it is closed under countable union and relative complementation: 1. bigcup_{n=1}^{infty} A_{n} in mathcal{R} if A_{n} in mathcal{R} for all n in mathbb{N} 2. A - B in mathcal{R} if A, B in mathcal{R} From these two properties we immediately see that bigcap_{n=1}^{infty} A_n in mathcal{R} if A_{n} in mathcal{R} for all n in mathbb{N}This is simply because cap_{i=1}^infty A_n = A_1 - cup_{n=1}^{infty}(A_1-A_n). If the first property is weakened to closure under finite union (i.e., A cup B in mathcal{R} whenever A, B in mathcal{R}) but not countable union, then mathcal{R} is a ring but not a ¿-ring.

Lisateave

Kirjastaja OmniScriptum
Väljalaskeaasta 2026
Kaanetüüp Pehme kaanega
EAN 9786131200359
Kirjuta oma arvustus
Te vaatate: Sigma-ring: Mathematics, Complement (Set Theory)
Teie hinnang:

Goodreads'i arvustused

100,18 € 166,96 €