Top nations in mathematics

Country	Papers	Citations	Citations per paper
1 Denmark	1,477	6,639	4.49
2 Scotland	2,153	9,454	4.39
3 United States	69,395	302,581	4.36
4 England	12,265	52,033	4.24
5 Switzerland	2,759	11,396	4.13
6 Norway	1,312	5,311	4.05
7 Singapore	1,401	5,640	4.03
8 Australia	6,079	24,216	3.98
9 The Netherlands	3,637	14,403	3.96
10 Sweden	2,931	11,411	3.89
11 Austria	2,450	9,480	3.87
12 Belgium	3,318	12,582	3.79
13 Finland	1,608	5,968	3.71
14 Israel	5,214	19,246	3.69
15 Germany	19,731	71,788	3.64
16 France	23,976	85,766	3.58
17 New Zealand	1,326	4,659	3.51
18 Canada	12,189	41,676	3.42
19 Chile	1,2	4,072	3.32
20 Italy	13,261	41,125	3.10

The data above were extracted from the Essential Science Indicators database of Thomson Reuters. This database, currently covering the period January 1998 through to December 2008, surveys only journal articles (original research reports and review articles) indexed by Thomson Reuters. Articles are assigned to a category based on the journals in which they were published and Thomson Reuters’ journal-to-category field-definition scheme. Both articles tabulated and citation counts to those articles are for the period indicated. Here our ranking in mathematics (including statistics) is by citations per paper – among nations that published 1,000 or more papers during the period – to reveal weighted impact. For articles with multiple authors from different nations, each nation receives full, not fractional, citation credit. Essential Science Indicators lists nations ranked in the top 50 per cent for a field over a given period, based on total citations. In mathematics, 83 nations are listed, meaning 166 were surveyed. Forty-two nations published at least 1,000 papers in this field during the period. For more information on Thomson Reuters’ Essential Science Indicators, see http://scientific.thomsonreuters.com/products/esi.