Introduction The main aim of this article is to describe the mechanics of certain types of operations on rings (e.g. A-operations on special A-rings or differentiation operators on rings withâ€¦ (More)

In this paper we describe three geometric applications of quandle homology. We show that it gives obstructions to tangle embeddings, provides the lower bound for the 4-move distance between links,â€¦ (More)

This thesis is concerned mainly with the interplay between identities involving power series (which are called q-series) and combinatorics, in particular the theory of partitions. The thesis includesâ€¦ (More)

E. Moggi, Categories of Partial Morphism and the p -calculus, In Category Theory and Computer Programming, Lecture Notes in Computer Science 240, SpringerVerlag, 1986. [Mog88a] E. Moggi,â€¦ (More)