Duality is the operation that interchanges hypervertices and hyperfaces on oriented hypermaps. The duality index measures how far a hypermap is from being self-dual. We say that an oriented regular hypermap has duality-type {l, n} if l is the valency of its vertices and n is the valency of its faces. Here, we study some properties of this duality index in oriented regular hypermaps and we prove...

We reply to the remarks by Láng and Horányi [Electrochim. Acta Vol. (2006) page] on the meaning of the notion of “electrosorption valency” used in I. Abou Hamad et al., Electrochim. Acta 50 (2005) 5518. It is concluded that, contrary to the assertion of Láng and Horányi, the magnitude of the current in the external circuit upon adsorption of an ion of charge ze with partial charge transfer is i...

The Valency Lexicon of Czech Verbs, Version 1.0 (VALLEX 1.0) is a collection of linguistically annotated data and documentation, resulting from an attempt at formal description of valency frames of Czech verbs. VALLEX 1.0 is closely related to Prague Dependency Treebank. In this paper, the context in which VALLEX came into existence is briefly outlined, and also three similar projects for Engli...

In this paper we aim to describe the latest work on the syntactic-semantic classification of verbs in Croatian language. We tried to extract the specific semantics and function of verb prefixes in Croatian and capture these specific features in the Croatian verb valency lexicon CROVALLEX. The syntactic and semantic connection between base verbs and derived prefixed verbs is revealed and modelle...

This paper presents a sophisticated way to search valency lexicons. We provide a visualization of lexicons with such built-in searching that allows users to draw sophisticated queries in a graphical mode. We exploit the PMLTQ, a query language based on the tree editor TrEd. For demonstration purposes, we focus on VALLEX and PDT-VALLEX, two Czech valency lexicons of verbs. We propose a common le...

In this paper we explore the idea of using verb valency information to improve verb phrase extraction from historical text. As a case study, we perform experiments on Early Modern Swedish data, but the approach could easily be transferred to other languages and/or time periods as well. We show that by using verb valency information in a post-processing step to the verb phrase extraction system,...

We introduce a project to enhance a valency lexicon of Czech verbs with semantic roles. For this purpose, we make use of FrameNet. At the present stage, frame elements from FrameNet have been mapped to valency complementations of verbs of communication and verbs of exchange. The feasibility of this task has been proven by the achieved inter-annotator agreement – 95.6% for the verbs of communica...

We define the operation of Petrie duality for maps, describing its general properties both geometrically and algebraically. We give a number of examples and applications, including the construction of a pair of regular maps, one orientable of genus 17, the other non-orientable of genus 52, which embed the 40-vertex cage of valency 6 and girth 5 discovered independently by Robertson and Anstee. ...

VALLEX is a valency lexicon of Czech verbs. We briefly introduce VALLEX and then describe and evaluate the VALEVAL experiment: annotation of 10256 corpus instances of 109 Czech verbs with valency frames. The inter-annotator agreement of three parallel annotations ranges from 61% to 74% and κ from 0.52 to 0.62. More than 8000 sentences are now available as the “golden VALEVAL” for word-sense dis...