Robotics Research Technical Report: Nonlinearity of Davenport-Schinzel, Sequences and of Generalized, Path Compression Schemes (Classic Reprint) - Tapa dura

Sinopsis

Excerpt from Robotics Research Technical Report: Nonlinearity of Davenport-Schinzel, Sequences and of Generalized, Path Compression Schemes

Davenport-schinzel sequences are sequences that do not contain forbidden subsequences of alternating symbols. They arise in the computation of the envelope of a set of functions. We show that the maximal length of a davenport-schinzel sequence composed of n symbols is where o(u) is the functional inverse of Ackermann's function, and is thus very slowly increasing to infinity. This is achieved by establishing an equivalence between such sequences and generalized path compression schemes on rooted trees, and then by analyzing these schemes.

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