"Fractions represent parts of a whole. A fraction has a numerator (top number) and denominator (bottom number). Decimals are another way to represent fractions. For example, 1/2 = 0.5, 1/4 = 0.25, and ...

Earlier this month the Mathematics Institute at Uppsala University hosted a conference called Categorification in Algebra and Topology, clearly a theme close to our collective heart. As yet there are ...