Greek students' understandings of the distinction between function and relation.

The article reports on a study published within the issue related to mathematics students' understanding of distinction between the concepts of function and relation in Greece. It examines students' awareness of the discrimination between function and relation, and the discrimination between the dependent and the independent variables. It presents results of the questionnaires and interviews that students experienced difficulties in answering them. It states that the students' examples and their application of the definition explored a constrained perception of the function concept. Therefore, in order to overcome the obstacle of confusing the function with a relation, it suggests a teaching of function oriented towards activities which demand the measure of a magnitude.