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A mathematical promenade along parallel paths

Published online by Cambridge University Press:  11 October 2023

Damjan Kobal*
Department of Mathematics, Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia e-mail:


Imagine that you go for a walk with your friend. You walk along a closed loop around a university campus, finishing at the point where you started. You and your friend keep the same distance throughout your walk. You walk on the ‘outside’.

© The Authors, 2023 Published by Cambridge University Press on behalf of The Mathematical Association

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