0

A collection $\xi = \{ G_a : a \in \Lambda\}$ of subsets of $X$ is said to be cover of $X$ if union of $G_{a \in \Lambda}$ equals to $X$.

A subclass $\xi'$ of a cover $\xi$ is said to be subcover of $\xi'$ if itself covers X.

what does subclass in the definition here means?

thanasissdr
  • 6,348
Kavita
  • 929
  • 1
    In this context it refers to a subset of the collection of subsets of $X$ which cover $X$, unless you wanted a more in depth explanation of a subclass? – AnotherPerson Oct 25 '15 at 05:45
  • 3
    subclass means subset of the collection. I think they are simply trying to avoid overusing the word "set" when they are referring to a set of sets. It's hard on the poor students. – fleablood Oct 25 '15 at 05:48
  • okey thanks got it – Kavita Oct 25 '15 at 05:50
  • Sorry , but you are not allowed to comment on quality of students. The vote is for the answer not for the comment "poor students". – Kavita Oct 25 '15 at 06:07

0 Answers0