Abstract
The study of functions is central to modern mathematics, and occupies the major
part of the time spent on this subject in the senior school. The concept itself is
rich and diverse, able to be conceived of using a variety of images, singly and in
combination. This study explores ways in which Australian secondary and
tertiary mathematics students think about functions in terms of both images and
definitions. It further investigates the extent to which these factors influence their
ability to discriminate between functions and non-functions, and to solve
problems involving functions and their properties. The results have implications
for both the teaching of functions, and the use of mathematical computer software
which facilitates the representation and manipulation of functions in a variety of
forms.
STEPHEN ARNOLD
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