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Classification of the Mathematics Library
Our books are clearly arranged by topic according to the MSC  Mathematics Subject Classification, which also describes the content of each book. So every book has a MSC call number (shelfmark) and possibly several other MSC subject codes to describe its content. MSC codes can easily be searched in the Knowledge Portal Primo search box.
Mathematics Subject Classification is also used by the American Mathematical Society and the Zentralblatt Math for indexing books and articles.
Structure of the MSC
The MSC is a hierarchical scheme, with three levels of structure:
Level  Example 

1. = Subject area  11 = Number theory 
2. = Subject category  11B = Sequences and sets 
3. = Topic  11B05 = Density, gaps, topology 
General groups and materials have a two level structure and are represented with a hyphen:
Level  Example  

1. = Subject area  26 = Real functions  
2. = Specific materials 

Our Call Number (Shelfmark)
Our call number is made up of the MSC subject code and the first two letters of the first author or editor:
Example  MSC  Call number 

"Lineare Algebra" by Gerd Fischer  1501  1501/Fi 
"How to write mathematics" by Norman E. Steenrod, Paul R. Halmos, Menahem M. Schiffer and Jean A. Dieudonné  00A25  00A25/St_1.Ex. 
"Finite frames" by Peter G. Casazza and Gitta Kutyniok (Editor)  42C15  42C15/Ca_4.Ex. 
Our books are sorted first by MSC, then within the subject code alphabetically by author, then ascending editions of the same book and at last sorted by copy count. The call number can be found at the bottom of the spine of every book.