... countable infinite product of lines, Bulletin of the American Mathematical Society 72 (1966), 515–519. 2 Merging of degree and index theoryfixed points of a pair ( f1, f2) of functions corresponds ... Department of Mathematics and Computer Science (WE1), Free University of Berlin, Arnimallee 2-6, 14195 Berlin, GermanyE-mail address: vaeth@mathematik.uni-wuerzburg.de 4 Merging of degree and index ... following statement, similarly asin the proof of Theorem 4.14. Let all assumptions of Theorem 4.14 be sat isfied (with the 12 Merging of degree and index theoryAssume by contradiction that this...