Thread:ClariS/@comment-3017217-20141115175820/@comment-3017217-20141127155903

"MATHEMATICS FOR ECONOMISTS I" FLYTZANIS ILIAS, 2008, ISBN: 978-960-8249-62-2

page 70

ε = Δx / Δy / x

It could be a typographical error but the book is 6 years old and most probably it would have been recalled if so.