
Classification Correlations 
Math on the Web > Classifications > Classification Correlations [Updated: June 1, 2011]
Correlations statistics on the use of classification in Mathematical Reviews through the years: The files are in gzipped form and consist of lines like
7894A3565C10\\68A25
where the first two digits denote the year until 2000, when all 4 digits begin to be used, and the next field between  separators gives the primary classification assigned the item. The secondary classifications, if any, follow the second , and if several are separated by \\.
To download the gzip file to your browser click on the year number below.
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
98
00
01
02
03
04
05
06
07


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