Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Top-designs in the category of Fort spaces   In infinite topological Fort space $X$, for nonempty subsets $C,D$ of $X$ in
the following text we answer to this question "Is there any $\lambda$ and
Top--design $C-(X,D,\lambda)$ of type $i$?" for $i=1,2,3,4$. We prove there
exist $\lambda$ and $C-(X,D,\lambda)$, Top--design of type 2 (resp. type 4) if
and only if $C$ can be embedded into $D$.

14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th