Some years ago, in my colourful and varied past, I was engaged in the study of teaching. Though not one of nature’s keenest mathematicians, I did surprisingly well in that subject, attaining a distinction for a particularly fruity essay, which I began with the following quotation. Nature, stretching Horace Davenport out, had forgotten to stretch him sideways, and one could have pictured Euclid, had they met, nudging a friend and saying: ‘Don’t look now, but this chap coming along illustrates exactly what I was telling you about a straight line having length without breadth. Uncle Fred in the Springtime A … Continue reading The breadth of Plum