The first and second principal components (joy-sadness and anger) explain only 41% of the variance. I wish the authors showed further principal components. Even principal components 1-4 would explain no more than 70% of the variance, which seems to contradict the popular theory that all human emotions are composed of 5 basic emotions: joy, sadness, anger, fear, and disgust, i.e. 4 dimensions.
Interesting. Apion's description of the pessoi game mentioned in the Odyssey: flicking pebbles toward the Penelope-pebble convinces me more than translating pessoi as draughts. The problem with Apion's description is:
- There were 108 suitors (we know this from the Odyssey 16.245-254 [1]).
- All that Homer told us is: They were gladdening their hearts at pessoi in front of the doors, sitting on the hides of oxen which they themselves had slain (the Odyssey 1.106-108 [2]).
- You can't have 108 sitting men play the same game of marbles.
IMHO, pessoi was a 1:1 game and it was not a board game.
I took the liberty to replace my awkward wording with your "the result in column i and row j is the sum of product of elements in column i of the left cracovian and column j of the right cracovian". Hope you don't mind. Thanks!
Thanks for the feedback, everyone. I pasted my Polish text into Gemini to translate it into English. Gemini hallucinated the translation of this example. Now it should be OK.
My map of the most frequent occupational surnames in Europe [1] also went viral in 2015. When I posted it on Reddit, newspapers from Ireland (they asked me for permission to reprint it) to Greece (nobody else asked) and countless people on Facebook republished it. Well, everybody has a surname, an occupation, and a country.
Late advice: when making a viral image, put your URL on it :-)
IMHO, Euclid's definition of a straight line in today's terms would be "a line that has the same direction on its entire length". His definition of a plane angle would be "a plane angle is the difference between the directions of two straight lines that have a common end in one point".
How about a third unit, baud [1]? It looks no worse than hertz to me:
In telecommunication and electronics, baud (/bɔːd/; symbol: Bd) is a common unit of measurement of symbol rate, which is one of the components that determine the speed of communication over a data channel. It is the unit for symbol rate or modulation rate in symbols per second or pulses per second.
I invented a game that uses tiles in the shape of a regular hexagon plus a rhombus. IMHO, you can tile the plane aperiodically with them. See the first picture in [1].
1. Find the Latin word for the color orange: "luteus".
2. Find Polish words corresponding to the Latin word in a scanned Latin-Polish dictionary from 1644.
3. Find Latin words corresponding to the Polish words in the Polish-Latin volume of the dictionary.
4. If new words found, GOTO 2
The main answer was "fawn", the color of deer. Besides "yellow-red" and "red-yellow", other words were based on red pine mushroom [1], fox, honey, fire, saffron, and gold.
IMHO, attempts to show literate programming on screen are doomed to meet with mediocre success. DEK invented literate programming with printed books in mind. I dare say that the only successful literate programs are books printed on paper.
First, in a printed book, it is easier to find a previous page and compare a fragment on it with the current fragment. Second, a printed book has no links tempting you with the words "CLICK ME" to disrupt the flow so you can read it from cover to cover with fewer distractions. Third, anecdotally, I can see flaws much easier on a printout than on screen, both in programs and in texts.
I like it! Here is a gotcha my students stumble on. I have not noticed it while skimming your book: ^ and $ do not have special priorities. To match alternatives, write ^(abc|def)$, not ^abc|def$