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Covering of ordinals

Abstract

The paper focuses on the structure of fundamental sequences of ordinals smaller than ee. A first result is the construction of a monadic second-order formula identifying a given structure, whereas such a formula cannot exist for ordinals themselves. The structures are precisely classified in the pushdown hierarchy. Ordinals are also located in the hierarchy, and a direct presentation is given

Similar works

This paper was published in Dagstuhl Research Online Publication Server.

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