In episode 3 I forgot to mention that in episode 2 we had made many references to ‘points on the number line’, e.g. that the point marking \sqrt{2} was missing from the (rational) line. The proof of Lemma 1 (episode 3) in the proof of the centroid (as where the three medians meet) made implicit use of the number line.
Eastern numerals : old and new
A couple of very different ways of writing numerals – see the slides or video for more.
Numbers and Numerals
This blog will have small messages related to the Short Stories from Mathematics series at the Tree House Bookshop. I shall try to post here fairly regularly while the series is ongoing.