In this paper some research trends are presented concerning the application of fuzzy techniques to model flexible systems for the access to information on the WWW. The focus is o...
Images of fuzzy relations provide powerful access to fuzzifications of properties of and/or relationships between fuzzy sets. As an important example, images of fuzzy orderings c...
The information used for the extraction of terms can be considered as rather 'internal', i.e. coming from the candidate string itself. This paper presents the incorporat...
We study two enumeration problems for up-down alternating trees, i.e., rooted labelled trees T, where the labels v1, v2, v3, . . . on every path starting at the root of T satisfy v...
We aim at a conceptually clear and technical smooth investigation of Ackermann's substitution method. Our analysis provides a direct classification of the provable recursive ...