Hyderabad received 248.3 mm of rainfall in the first 15 days of October. This is the highest rainfall during October in the last 100 years. In October 1916, Hyderabad received 355.1 mm of rainfall, which is an all-time record.
My earlier posts about using Vim were well received and it’s about time for an update. I’ve been doing a lot more work with Vim lately and have spent some time configuring my workflow for peak efficiency, so here’s a snapshot of my current state.
You know the routine. You come across a topological space X and you need to find its fundamental group. Unfortunately, X is an unfamiliar space and it's too difficult to look at explicit loops and relations. So what do you do? You look for another space Y that is homotopy equivalent to X and whose fundamental group is much easier to compute. And voila! Since X and Y are homotopy equivalent, you know that the fundamental group of X is isomorphic to the fundamental group of Y. Mission accomplished. Below is a list of some homotopy equivalences which I think are pretty clever and useful to keep in your back pocket for, say, a qualifying exam or some other pressing topological occasion.
In the spring of 2010, I was privileged to have a conversation with Simon Schaffer, who pointed me to the work of a sociologist and philosopher of science named Harry Collins. This year, I discovered and read Collins' new book, Tacit and Explicit Knowledge, and a somewhat older book, The Shape of Actions (co-authored with…