My webpage in Wrocław. I've been here before. Researchers taking a stand against Elsevier. Ggt seminar in Warsaw. Dgt seminar in Wrocław. All my papers on arXiv BibTEX form Courant Research Centre and arXiv Reviews on MathSciNet and Zenterblatt math Google Scholar profile pok. 5210 ✉ Instytut Matematyki uw ul. Banacha 2 02-097 Warszawa Pologne ☎ (48) 22 554 4521 S.Gal@mimuw.edu.pl „Die Grenzen meiner Sprache bedeuten die Grenzen meiner Welt“ (Ludwig Josef Johann Wittgenstein)