To find books on Mathematics you can browse the library shelves in these call number ranges:
QA 1 - 43 General Mathematics
QA 47 - 59 Tables
QA 71 - 90 Instruments and Machines
QA 101 - 145 Elementary Mathematics. Arithmetic
QA 150 - 272.5 Algebra
QA 299.6 - 433 Analysis
QA 440 - 699 Geometry. Trigonometry. Topology
QA 801 - 939 Analytic Mechanics
The library is catalogued according to the Library of Congress and from here you can see a break down of all call number ranges.
You can find a number of eBooks on mathematics by searching the library catalogue but the databases listed below are not indexed in the UML catalogue.