*Valid September 30, 2024 - December 25, 2024 at Canadian stores and at indigo.ca, while quantities last, with $50.00 or more pre-tax purchase of eligible product(s), after discounts and plum points redemptions. Minimum purchase amount excludes gift cards, plum+ memberships, Love of Reading products/donations, and shipping costs. Selection may vary between stores and online.
Functional Equations and How to Solve Them/en-ca/functional-equations-and-how-to-solve-them/57EA350D-4A4A-41D3-8755-B6CDBB89D75E.html57EA350D-4A4A-41D3-8755-B6CDBB89D75E