Teaching Mathematics and its Applications Advance Access originally published online on November 3, 2008
Teaching Mathematics and its Applications 2009 28(1):10-15; doi:10.1093/teamat/hrn022
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HMS—harmonic motion by shadows

Department of Mathematics, PO Box 220, University of Reading, Whiteknights, Reading, UK
Department of Mathematics, PO Box 220, University of Reading, Whiteknights, Reading, UK
E-mail: p.glaister{at}reading.ac.uk
Submitted June 2008; accepted October 2008
A problem is discussed which is generated by shadows and which is a generalization of simple harmonic motion.
Paul Glaister graduated from the University of Reading with a degree in Mathematics and subsequently gained a Postgraduate Certificate in Education and an MSc in the Numerical Solution of Differential Equations at the same university. He worked as a mathematics teacher in a secondary school before returning to Reading as a Research Fellow, while studying part-time and obtaining a PhD. He is currently employed at the University of Reading as a lecturer in applied mathematics.
Elizabeth Glaister graduated from the University of Reading with a degree in Mathematics and subsequently gained a Postgraduate Certificate in Education at the same university. Since then, she has taught mathematics in various schools, as well as bringing up two children. She is currently employed as a mathematics teacher at Kendrick School in Reading and as a lecturer at the University of Reading.