Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hammer PDF: An Intelligent PDF Reader for Scientific Papers   Reading scientific papers has been an essential way for researchers to
acquire academic knowledge, and most papers are in PDF format. However,
existing PDF Readers only support reading, editing, annotating and other basic
functions, and lack of multi-granularity analysis for academic papers.
Specifically, taking a paper as a whole, these PDF Readers cannot access
extended information of the paper, such as related videos, blogs, codes, etc.;
meanwhile, for the content of a paper, these PDF Readers also cannot extract
and display academic details of the paper, such as terms, authors, citations,
etc. In this paper, we introduce Hammer PDF, a novel intelligent PDF Reader for
scientific papers. Beyond basic reading functions, Hammer PDF comes with four
innovative features: (1) locate, mark and interact with spans (e.g., terms)
obtained by information extraction; (2) citation, reference, code, video, blog,
and other extended information are displayed with a paper; (3) built-in Hammer
Scholar, an academic search engine that uses academic information collected
from major academic databases; (4) built-in Q\&A bot to support asking for
interested conference information. Our product helps researchers, especially
those who study computer science, to improve the efficiency and experience of
reading scientific papers. We release Hammer PDF, available for download at
https://pdf.hammerscholar.net/face.

4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn