Archive for Isle of Lewis

a journal of the conquest, war, famine, and death year

Posted in Books, Kids, pictures, Statistics, Travel, University life with tags , , , , , , , , , , , , , , , , , , , , , , on June 25, 2023 by xi'an

Read both following volumes of Peter May’s Lewis trilogy, The Lewis Man and The Chessmen. The stories remain focussed on the same few characters as in the first volume, with some predictable developments and a rather heavy borrowing to the local history in the shape of a peat-bog mommy or a plane crash. And of the terrible early 20th Century policies of dispatching orphans throughout Scotland without ever checking on their well-being. Rather disappointing in the end with way too many convenient coincidences, implausible twists of fate, and larger than life characters. (And very artificial dialogues of teenagers, either in the 1980’s or in the 2010’s.) Read also two remarkable Tanizaki’s short stories, Fumiko’s feet and The mermaid’s lament. Which demonstrate impressive writing style. And his Diary of a mad old man, written in a completely different way, about an hypochondriac old man obsessed by his son’s wife, who negotiates glimpses at the highest price. It reminded me of Kawabata’s Sound of the Mountain, although the later is much more ambiguous on that relation. (Obviously not the only one to note the similarities.)

Moved the title of this recurring post to add another horseman for another year. Next round, if any, I will have to borrow a fifth horseman from Terry Pratchett!

Had another great lunch at KGB, in the Odéon district of Paris, which stands for Kitchen Gallery Bis and has no obvious Russian connections. Both the surprise collection of primi piatti (incl. a wagyu bouillon and a cold squid salad) and the half-baked tuna were original and an avalanche of flavours. I skipped the desert, centred on rhubarb, as this is our current fare, making fresh rhubarb [from the farmers’ market] marmalade once or twice a week (with a heavy spoonful of ginger).

Watched part of The Mother, a total waste of time as another action movie with implausible situations, a complete disregard to real life constraints, and the permanent glorification of guns.

book reviews

Posted in Books, Kids, Mountains, pictures, Travel with tags , , , , , , , , , , , , on May 8, 2023 by xi'an

“I believe neither in luck nor in destiny, I trust only the science of probabilities. I have studied mathematical statistics, combinatorial analysis, mass functions, and random variables, and they never have held any surprise for me.”

Over the past weeks, I read  both second and third volumes of The Mirror Visitor series, by Christelle Dabos, keeping to the (remarkable) English translation. With a new dramatic challenge and a new location facing the heroine in each volume, following the classical unities!, although the overall goal of defeating “God” remains. Enjoying both the universe building and (mostly) the heroine’s perspective, much less the repeating pattern of her interactions with her almost abusive husband. And even less the communitarianisation of people by their magical skills (albeit a common flaw in fantasy literature!). While possibly slowing down, the third volume remains a page turner and reenacts another common feature of YA fantasy books, namely the magician school, albeit with a welcome distanciation from Ophelia who suffers it to reach the “finis Africae” of the Babel library (which obviously reminded me of Borges). And still enjoying the covers by Laurent Gapaillard!

I also read Peter May’s Black House, a detective story about an perplexing (of course!) murder, coupled with a trauma reminisced by the main (?) character (or the reverse). The scene is the Isle of Lewis, Scotland, part of the Outer Hebrides along with Harris, of tweed fame. And quite distinct from the rest of Scotland. Inducing well-done if somewhat repetitive descriptions of the landscape and the weather. Actually the book insists way too much on these peculiarities and seems intent in going through all of them (crofters, chessmen, peat harvesting, rigid Presbyterianism, Gaelic speakers, and gannet hunting). Nonetheless, it presents an interesting triangle between the main characters and, while the reasons leading to the murder require some suspension of belief due to the excessive accumulation of terrible deeds, the reminiscence (and lack thereof) of the adult detective of his childhood is well done, although he does not emerge that well from the unraveling of his younger self, even when comparing with other Tartan noir characters like McIlvanney’s Laidlaw and Rankin’s Rebus. I hope the following volumes keep the same tension, despite the idiosyncrasies of the place being exhausted…

value of a chess game

Posted in pictures, Statistics, University life with tags , , , , , , , , , , , , on April 15, 2020 by xi'an

In our (internal) webinar at CEREMADE today, Miguel Oliu Barton gave a talk on the recent result his student Luc Attia and himself obtained, namely a tractable way of finding the value of a game (when minimax equals maximin), result that got recently published in PNAS:

“Stochastic games were introduced by the Nobel Memorial Prize winner Lloyd Shapley in 1953 to model dynamic interactions in which the environment changes in response to the players’ behavior. The theory of stochastic games and its applications have been studied in several scientific disciplines, including economics, operations research, evolutionary biology, and computer science. In addition, mathematical tools that were used and developed in the study of stochastic games are used by mathematicians and computer scientists in other fields. This paper contributes to the theory of stochastic games by providing a tractable formula for the value of finite competitive stochastic games. This result settles a major open problem which remained unsolved for nearly 40 years.”

While I did not see a direct consequence of this result in regular statistics, I found most interesting the comment made at one point that chess (with forced nullity after repetitions) had a value, by virtue of Zermelo’s theorem. As I had never considered the question (contrary to Shannon!). This value remains unknown.