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JOURNALS // Zapiski Nauchnykh Seminarov POMI // Archive

Zap. Nauchn. Sem. POMI, 2025 Volume 549, Pages 41–48 (Mi znsl7666)

Isomorphic Loday functors of non-homeomorphic spaces

I. S. Baskov

St. Petersburg Department of Steklov Institute of Mathematics, Fontanka 27, St. Petersburg 191011, Russia

Abstract: Each commutative algebra $A$ gives rise to a representation $\mathcal{L}_A$, which we call the Loday functor of $A$, of the category $\Omega$ of finite sets and surjective maps. In this paper we present two (infinite-dimensional) non-isomorphic algebras over $\mathbb{C}$ with isomorphic Loday functors, namely, the algebras of continuous functions on the Möbius strip and on the cylinder.

Key words and phrases: Loday functor, representation of category, category of finite sets and surjections, functor isomorphism.

UDC: 512.583

Received: 15.12.2025

Language: English



© Steklov Math. Inst. of RAS, 2026