Öğrencilerin İki Değişkenli Fonksiyon Kavramını Anlamalarının Apos Teorisi İle Analizi
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In this research, the students' understanding of two variable functions was analyzed within the framework of APOS theory. In the study, the case study of qualitative research methods has been used. The study/research group consists of six students who are studying at the Department of Mathematics and Science Education, Mathematics Education Department of a state university. When participants are determined, it is taken into account that they had taken the courses of Analytical Geometry and Analysis I, II, III and IV in the mathematics curriculum and was successful. The data of the study, Two Variable Functions-Conceptual Comprehension Test and the written answers given by the students through this measurement tool and the voice recordings of the clinical interviews about these questions are constituted. The obtained data has been analyzed with content analysis using genetic decomposition of two variable functions by Trigueros and Martinez-Planell (2007; 2010) in the context of APOS theory. According to the results of the study; students cannot associate two variable functions with three dimensional space concept. There are no students who bring the concept of two variable functions as object. In the light of these results, some suggestions has been presented about the given analysis courses and thinning of the genetic decomposition.