KONSTRUKSI KONSEP FUNGSI MATEMATIS BAGI SISWA SMA BERDASARKAN TEORI APOS

This study aims to describe the construction of the concept of mathematical functions for high school students based on APOS Theory. The approach used in this study is the APOS Research Cycle. The subjects of this study is student of class X SMA Negeri 4 Serang City who had received material on composition functions and inverse functions. The instruments used in this study were written test questions in the form of descriptions and semi-structured interviews. The data analysis technique was carried out qualitatively with 3 stages, namely data reduction, data presentation, and verification or drawing conclusions. The results showed that students experienced spesific mental mechanisms in constructing the concept of mathematical functions. This study also proves that the interiorization stage (action to process) is an important stage in constructing the concept of mathematical functions because it affects the perfection of construction at the next stage, both in process, object, and schema.