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math.AT2020★ 13 cited
Cochain level May-Steenrod operations
Ralph M. Kaufmann, Anibal M. Medina-Mardones
Steenrod defined in 1947 the Steenrod squares on the mod 2 cohomology of spaces using explicit cochain formulae for the cup- products; a family of coherent homotopies derived fr…
math.AT2020★ 3 cited
Three Hopf algebras from number theory, physics & topology, and their common background II: general categorical formulation
Imma Gálvez-Carrillo, Ralph M. Kaufmann, Andrew Tonks
We consider three a priori totally different setups for Hopf algebras from number theory, mathematical physics and algebraic topology. These are the Hopf algebra of Goncharov for m…