University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 6 2 1995 06 01 THE DERIVED GROUP OF A SEIFERT FIBRE GROUP - 31416 EN Journal Article Every Seifert Fibre Group is the lift of a Fuchsian group to the universal covering group of PSL (2,R). From this, we work out a form of presentation for such a group. With the calculation of the Euler number, we can establish the presentation of the derived group of a Seifert Fibre Group https://jsciences.ut.ac.ir/article_31416_d80c2e64d4eaec667e3a3e05d935fe8c.pdf