Dirk Kreimer (born 1960) is a German physicist who pioneered the Hopf-algebraic approach to quantum field theory with Alain Connes and other co-authors.
Miriam Cohen (born October 1941) is an Israeli mathematician and a professor in the Department of Mathematics at Ben-Gurion University of the Negev whose main areas of research are Hopf algebras, quantum groups and non-communicative rings.
in a Hopf algebra, an element X on which the comultiplication Δ has the value Δ(X) = X⊗1 + 1⊗X
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