Ingmar Lehmann Books

Pi
Pi

By Alfred S. Posamentier, Ingmar Lehmann

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Magnificent mistakes in mathematics
Magnificent mistakes in mathematics

By Alfred S. Posamentier

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"Requiring no more than high-school-level math competency, this playful excursion through the nuances of math will give you a better grasp of this fundamental, all-important science"--

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What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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