The Institute of Mathematics and Computer Science, University of Latvia (IMCS UL)   is a non-profit organisation established in November, 1959 as Computing Centre of research character. IMCS UL is supervised by the Ministry of Education, Republic of Latvia. Currently IMCS UL is the leading research institution of in mathematics and computer science. Its staff includes 110 researchers.

The main research directions of IMCS UL are telecommunications, Internet technologies and their applications, system modeling and design, simulation of physical and technological processes, natural language processing, theoretical investigations in mathematics etc. The Institute houses the graduate (master) studies in Computer Science at the University of Latvia for approximately 250 students. IMCS UL also maintains Latvian country code top level domain. lv.

In 1992 IMCS UL has founded the Academic Network LATNET as a separate unit of the Institute. In 2007 it was renamed to SigmaNet, the National Research and Education Network (NREN), which provides access to the GEANT2 infrastructure and ofers varius services.

The network was created with support of international projects by EC - Baltbone-1, Baltbone-2, Baltic Information Infrastructure Pilot Project BIIP etc. LATNET was successful in implementing the wireless access to the Internet in expending wireless Internet services to 25 of 's regions.

SigmaNet investigates the possibilities of implementing the new telecommunication technologies in business and everyday life. SigmaNet is very active also in various projects about security, connectivity, applications. SigmaNet is a member of RIPE, TERENA, CEENet.

IMCS UL has participated in many other EC funded projects, including GN2, GEANT, EASYCRAFT, IDEALIST, CULTIVATE, INTACCOMP, MolPage and others.