Category:Definitions/Sigma-Rings
Jump to navigation
Jump to search
This category contains definitions related to Sigma-Rings.
Related results can be found in Category:Sigma-Rings.
A $\sigma$-ring is a ring of sets which is closed under countable unions.
That is, a ring of sets $\Sigma$ is a $\sigma$-ring if and only if:
- $\ds A_1, A_2, \ldots \in \Sigma \implies \bigcup_{n \mathop = 1}^\infty A_n \in \Sigma$
Subcategories
This category has only the following subcategory.
S
Pages in category "Definitions/Sigma-Rings"
The following 5 pages are in this category, out of 5 total.