The Sigma Group was an experimental group active in Timişoara between 1969–1980 and consisting of Ştefan Bertalan, Lucian Codreanu (matematician, from 1970), Constantin Flondor, Ioan Gaita, Elisei Rusu (shortly), Doru Tulcan (1969–1978). Its programme was both artistic and pedagogic; its members were teachers at the Fine Arts Academy in Timisoara. The group put emphasis on teamwork and interdisciplinarity (integrate mathematics, cybernetics, bionics, psychology, and architecture in the arts), used variety of media (paper, cardboard, wood, aluminum, glass, stiplex, synthetic materials, photography, film), and was influenced by Bauhaus, constructivism and new trends in art and architecture.
The name 'Sigma' appeared only after Codreanu's accession in 1970, but the group had formed already in 1969.
Dismantling of the group took place slowly, over several years and has never been declared formally. The last event all members took part was in 1976 on the banks of the Timis River. Multivision of Flondor and Tulcan in 1978 in the gym of School of Fine Arts Timişoara was the last public demonstration of Sigma; all group members attended. In 1978 the group entered a period of crisis after Bertalan was moved to the Institute of Architecture. Afterwards, the group splits.