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Journal Articles Order Year : 2018

Majors of functions

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Abstract

We investigate the minor order of functions, focusing on upper covers and common upper bounds of pairs of functions. We show that two functions of arities m and n have a common upper bound if and only if they have a common lower bound, and if a common upper bound exists, then there is one of arity m + n − 1. Moreover, we determine the possible essential arities of upper covers of functions.
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Dates and versions

hal-01519377 , version 1 (07-05-2017)

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Miguel Couceiro, Erkko Lehtonen. Majors of functions. Order, 2018, 35 (2), pp.233-246. ⟨10.1007/s11083-017-9428-1⟩. ⟨hal-01519377⟩
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