In our paper we analyze the data about works (papers, books) from time period of 1990-2010 that are collected in Zentralblatt MATH Database. This database is produced by the Berlin editorial office of FIZ Karlsruhe in cooperation with European academies and mathematical institutes. We converted these data into four 2-mode networks (works x authors, works x journals, works x keywords and works x MSCs) and a partition by publication year. The networks were analyzed using Pajek - a program for analysis and visualization of large networks. We explore the collaboration network among mathematicians and compare the MSC (Mathematical Subject Classification) with the real structure of mathematics as is realized with the publications.