In mathematics, a subset of a given set is closed under an operation of the larger set if performing that operation on members of the subset always produces a member of that subset. For example, the natural numbers are closed under addition, but not under subtraction: 1 − 2 is not a natural number, although both 1 and 2 are.
Similarly, a subset is said to be closed under a collection of operations if it is closed under each of the operations individually.
The closure of a subset is the result of a closure operator applied to the subset. The closure of a subset under some operations is the smallest superset that is closed under these operations. It is often called the span (for example linear span) or the generated set.
In our life sometimes we questioned things and we looked for an answer. There is one thing that happened to me that until now I feel it needs closure.
Unfortunately, wala akong balita sa kanila ngayon. I didn’t even see them in soc med. Anyhow, I just wanna share my story through this forum...
Hello guys,
We would like to inform you that we have decided to shut down our site.
The past 2 years have been very difficult for us - some of the people in our team died due to covid complications,
others still suffer the side effects of it - not being able to work at all.
Some are also...