Preprint Nr. 361 Variation — eine fundamentale Idee Hans Schupp zu seinem 80. Geburtstag gewidmet Horst Hischer Saarbrücken 2015 Fachrichtung 6.1 – Mathematik Universität des Saarlandes Preprint No. 361 submitted: June 10, 2015 Variation — eine fundamentale Idee Hans Schupp zu seinem 80. Geburtstag gewidmet Horst Hischer Saarland University Department of Mathematics P.O. Box 15 11 50 66041 Saarbrücken Germany [email protected] Edited by FR 6.1 — Mathematik Universität des Saarlandes Postfach 15 11 50 66041 Saarbrücken Germany Fax: e-Mail: WWW: + 49 681 302 4443 [email protected] http://www.math.uni-sb.de/ HORST HISCHER 9DULDWLRQ²HLQHIXQGDPHQWDOH,GHH Hans Schupp zu seinem 80. 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