Another (very) late edition and in the same week [see previous post]. In this case, it’s because I hadn’t planned a Friday Notes post for today, but I’ve gotten so indolent lately that I’m falling out of the habit of blogging. (Or, the eternal question, have I perhaps gotten weary of it?)
But, as polite people say, “Stuff happens.” And because it does, I have enough perishable notes that I may have to put out two Notes editions this month.
Assuming I can get back in the blogging habit.
A late edition Mystery Monday post because I’ve been distracted by various and sundry. I’ve meant this for more than one previous Monday. Not gonna miss another.
Having pretty thoroughly explored the British Queens of Crime as well as (the American) Ellery Queen, I’ve turned to new pastures: the Butch Karp / Marlene Ciampi stories by Robert K. Tanenbaum and the Matthew Scudder stories by Lawrence Block. And French author Maurice Lablanc!
Plus, I’m disgruntled by Dark Winds, an AMC TV series that (too loosely, IMO) adapts two novels from the Navajo Tribal Police series by Tony Hillerman.
Long ago (in the first year of this blog), I posted Sideband #34: The North Star, which was about how sighting on the North Star (Polaris) gives you your latitude. Simply put, the elevation of the star is your latitude. My Twin Cities are at 45° north, so Polaris is 45° above my northern horizon. Simple!
In this Sideband, I’ll explain how you can use your wristwatch as a compass. Assuming your watch is an analog one with hands. And assuming you can see the Sun (so this doesn’t work at night).
But, unlike North Star navigation, this one does work in the southern hemisphere.
Mathematician and educator John Baez has been putting out an excellent series of posts about music theory on his blog. The most recent, the seventh, is about how you can generate scales by picking out piano notes in intervals of fifths. What’s interesting is that you can generate all seven major scale modes in each of the twelve keys (a total of 84 scales).
It’s very cool (and new to me how this works out), and John asked if any of his readers would be interested in creating a table of all 84 rows. That’s exactly the sort of little project that often catches my eye.
A new and different problem to solve!
We’re about to enter a new phase of Friday Notes. I’ve cleared most of the primary pile of notes for blog posts. What remains are notes that still might lead to posts if I find the motivation. There is also a thick sheaf of much older more ambitious notes, most of which are probably past their Use-By date by now.
The destiny of that thick sheaf remains to be seen, but I recently dug out an even older set of notes. Two old spiral-bound half-sized notebooks… from the late 1970s and early 1980s! One contains thoughts and ideas, the other fragments of song lyrics.
I haven’t looked at this stuff in years. Going through it, I decided to record some of the more interesting in blog posts before I toss those notebooks.
At some point in our early math education, we’re told that anything to the power of zero evaluates to one. 1°=1 and 5°=1 and 99°=1. Basically, x°=1 for all x. It’s typically presented as just a rule about taking anything to the power of zero, but it’s actually derived from a more basic rule about exponents.
Thinking about x° in connection with something else recently, it occurred to me there’s a second way to justify the notion that anything to the power of zero is one.
It also occurred to me 0ⁿ might be an implementation of the Dirac delta.
Last month when I published the Blog Anniversary post I lamented how yet another WordPress “update” had made it harder for me to copy the monthly post hit stats to my SelectedPosts database so I could make charts. The new table widget doesn’t allow selecting and copying [big frown].
Turns out my browser can be cajoled into making a screen grab that successfully interprets the image as a table with text, so it’s possible to capture the data, but looks to be a royal PITA, so it may be that the monthly hit stat ship has sailed.
But then I realized I had yearly hit stat data readily available.
Last Saturday, thanks to Amazon Prime, I screened a theme-related science fiction double-feature: The Day the Earth Stood Still (2008) and Arrival (2016). Both are fairly recent films about aliens visiting the Earth on mysterious missions.
The former, of course, is a remake of the 1951 same-named classic — a film good enough to have stood the test of time. Which, for science fiction films, is saying something. The remake suffers in comparison (and because it’s a remake) but considered on its own is an okay SF movie.
Arrival is generally a better film, but I do have a few issues with it.
It has been almost four weeks since my last blog post. I decided to take something of a vacation to celebrate various anniversaries (the blog, 12 years; retirement, 10 years; buying this condo, 20 years). And to celebrate finally getting some long-standing tasks off my TODO list (such as finally making a will).
Being retired puts a new spin on vacations, though. Being retired is vacation: your hard-earned, well-deserved permanent vacation. How does one take a vacation from a vacation?
Regardless, today is the last chance for a July edition of Friday Notes, so vacation-vacation is over, and it’s back to just being on vacation.
It’s that time again, my blog anniversary. It’s been twelve years, more than 1300 posts (plus a few dozen pages), and almost two million words (1.7 and change). That’s a fair amount of water over the dam. That said, the river flows a bit slower these days.
This 12-year anniversary comes on the heels of the 10-year anniversary of being retired. While the perceived importance of tens is a very human conceit (you’d expect the Simpsons and Mickey Mouse to attach that same importance to eights), twelves have a nice mathematical importance — there are more ways to evenly divide it: 2, 3, 4, and 6 (compared to the 2 and 5 of tens or the 2 and 4 of eights).
(That nice divisibility is handy with our 12-hour clocks and 12-month years.)
Posts pertaining to programming!
Logos con carne 