From Abstraction to Action [first of 100 posts in 100 days]

By way of, ahem, encouragement, the lovely Alexandra Deschamps-Sonsino last week challenged/shamed me into writing 100 posts in 100 days. This is 1/100. Fortunately I already had something partly written. It’s occurred to me that a lot of thought, discussion and debate goes into the talks I give (I pretty much never do the same talk twice), and yet I almost …