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On the growth rate of polyregular functions

Speaker(s)
Mikołaj Bojańczyk
Affiliation
MIM UW
Date
April 12, 2023, 2:15 p.m.
Room
room 5050
Seminar
Seminar Automata Theory

Polyregular functions are string-to-string functions that have polynomial size outputs. I will show that a polyregular function has growth rate O(n^k) if and only if it can be defined by an mso transduction of dimension k. On the other hand, the former two conditions are not equivalent to k-pebble automata; in fact there are polyregular functions of quadratic growth that require arbitrary numbers of pebbles to be computed.