Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How weak is weak extent?   A space X is star-Lindelof provided for every open cover U there is a finite
subset A of X such that St(A,U)=X. We show that a Tychonoff star-Lindelof space
can have arbitraryly big extent while the extent of a normal star-Lindelof
space can not be greater than c.

21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess