Archive for November 2010
Ore numbers: how do they grow?
Posted by: Gary Ernest Davis on: November 15, 2010
An Ore number (also known as a harmonic divisor number) is a number whose harmonic mean of its divisors is an integer. The harmonic mean of a set of numbers is . When the are the whole number divisors of the number n, then we get the harmonic mean of the divisors of n. These […]
Turning a heel: can knitting contribute to mathematics education?
Posted by: Gary Ernest Davis on: November 14, 2010
Turning a heel when knitting a sock is a big deal for beginning knitters. The Yarn Harlot (Steph Pearl-McPhee: @YarnHarlot) writes in her book “Knitting Rules!“, that: “Turning the heel is a mythic act, one that sock knitters speak of with reverence. Turning the heel is when you, through an incredibly simple but clever series […]
