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• Fuzzy Datalog with background knowledge

  257-281

  Ágnes Achs

  Views:

  13

  In this paper we give a possible model for handling uncertain information. The concept of fuzzy knowledge-base will be defined as a triplet of a background knowledge defined by the similarity of predicates and terms; a deduction mechanism: a fuzzy Datalog program, and a decoding set of the program, which help us to determine the uncertainty level of the results.

• Teaching fractions at elementary level in the light of Hungarian mathematics textbooks in Romania

  149-159

  Tünde Klára Baranyai

  Views:

  80

  According to the new curriculum in Romania, fractions are introduced in the second grade. The present study analyses Hungarian elementary mathematics textbooks on the topic of fractions focusing on the types of tasks in the textbooks, the significance of representations and the proportion of word problems. Additionally, the paper presents a questionnaire-based research on teachers’ opinion regarding the adequacy and sufficiency of the digital materials and exercises related to fractions in the textbooks.

  Subject Classification: 97F40, 97F80, 97U20, 97U50

• Development of high school students' geometric thinking with particular emphasis on mathematically talented students

  93-110

  Ákos Győry

  Eszter Kónya

  Views:

  15

  We carried out research using Zalman Usiskin's test (1982) and also a modified version of his test to see how the geometric approach of secondary school students (Grades 8-10) specialized in mathematics had changed. We observed two groups of students for several years. Our aim was to find a relation between the change of the mean of the van Hiele level of the students and the structure of the geometry syllabus. We also observed if there was a change in the geometric approach of the students during the summer holidays and if so, in what way it changed.