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Classification of tensor products of symmetric graphs

Wilfried Imrich, Aleš Pultr (1991)

Commentationes Mathematicae Universitatis Carolinae

In the category of symmetric graphs there are exactly five closed tensor products. If we omit the requirement of units, we obtain twelve more.

Cohomology operations and the Deligne conjecture

Martin Markl (2007)

Czechoslovak Mathematical Journal

The aim of this note, which raises more questions than it answers, is to study natural operations acting on the cohomology of various types of algebras. It contains a lot of very surprising partial results and examples.

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