## hands-on probability 101

Posted in Books, Kids, pictures, Statistics, University life with tags , , , , , , , , , on April 3, 2021 by xi'an

When solving a rather simple probability question on X validated, namely the joint uniformity of the pair

$(X,Y)=(A-B+\mathbb I_{A

when A,B,C are iid U(0,1), I chose a rather pedestrian way and derived the joint distribution of (A-B,C-B), which turns to be made of 8 components over the (-1,1)² domain. And to conclude at the uniformity of the above, I added a hand-made picture to explain why the coverage by (X,Y) of any (red) square within (0,1)² was uniform by virtue of the symmetry between the coverage by (A-B,C-B) of four copies of the (red) square, using color tabs that were sitting on my desk..! It did not seem to convince the originator of the question, who kept answering with more questions—or worse an ever-changing question, reproduced in real time on math.stackexchange!, revealing there that said originator was tutoring an undergrad student!—but this was a light moment in a dreary final day before a new lockdown.

## visitors allowed in Svalbard

Posted in Statistics with tags , , , , , , , , , , , , , , , on November 8, 2020 by xi'an

Posted in Books, Travel with tags , , , , , , , , , on August 17, 2020 by xi'an

Here are the five nominees for the World Fantasy Award 2020, not that I am familiar with this other award, which 2019 selection does not cover my reading list. And neither does the 2018 edition. Except for the unique ravenesque Ka. At least, this year, I have voraciously read one of them, tremendously enjoyed other books by Ann Leckie, and would be most tempted by reading Japanese fantasy. Adding to my already high pile of books to take on (potential) vacations for the end of the month… or to read at home if again quarantined.

## squash invasion

Posted in pictures, Wines with tags , , , , , , on August 1, 2020 by xi'an

## a journal of the plague year [more deconfined reviews]

Posted in Books, Kids, pictures with tags , , , , , , , , , , , , , , , , , , on July 18, 2020 by xi'an

Took a copy of Room 10 by Åke Edwardson yet again on the book sharing shelves at Dauphine. And read it within a few days, with limited enthusiasm as the story proceeds quite sluggishly, every single clue is driven to its very end, e.g. detailing the examination of security recordings for pages!, the Swedish background is mostly missing, the personal stories of the policemen prove frankly boring, and the final explanations stand way beyond a mere suspension of belief. The book is back on the shelves.

Watched the beginning of the Salvation series and quickly gave up. Because I soon realised it had nothing to do with the Peter Hamilton’s trilogy. And because the story did not seem to get anywhere, despite the impending destruction of Earth by a massive asteroid, turning into an East versus West spy story. And because the scientific aspects and characters were plain ridiculous. And also because the secondary plot about whom should be saved in case of a destruction was quite distasteful in its primitive eugenism.

Read an Indriðason I had not yet read, Sons of dust [Synir duftsins], the first book he wrote, but ironically rather repetitive on the themes of missing fathers, child abuse, social consequences of the second World War allied occupation, found in the subsequent volumes. And a rather unconvincing plot, especially from a genetic engineering perspective. (The book is not currently available in English. I read it in French.)

Eventually came to watch There will be blood, the 2007 masterpiece by Paul Anderson, with Daniel Day-Lewis rendering so impressively the descent into madness of the oil tycoon and his thirst for absolute control, loosing his adopted son in the process. And unable to stop at exposing the duplicity of the preacher whom he fought the entire film. The ending is somewhat less impressive than the rest, maybe because all is finished, but it does not diminish the raw power of this tale. And the music track is perfect, with Brahms’ Violin Concerto as a leitmotiv. A journey into oily darkness…