Advent of CodeI have decided to use literature programming for this years Advent of Code and not to compete with others. See this GitHub repository for my progress. I already made some improvements to MarkDownC. I also started developing a language for Advent of Code puzzles. I have no idea how that is going to work out.
Wednesday, November 30, 2022
BookAt 16:57:20, I bought the book Geschiedenis van de moderne literatuur written by Herman Brusselmans in Dutch and published by Prometheus in 2021, ISBN:9789044648904, from bookshop Broekhuis for € 17.95.
Going into the cityI went biking to the city center. I walked to Fotogalerie Objektief where I saw the exhibition Bomen in het park (Trees in the park) by Ruth Lowie. I went to Concordia, where they did not have any new exhibition. I looked at the books at the low round table in the middle of the exhibition Doublet: Thijs Ebbe Fokkens & Silke Schönfeld and I made notes of the titles of two of them: The Immortality Key: Uncovering the Secret History of the Religion with No Name by Brian C. Muraresku and being aware of being aware by Rupert Spira. I also visited bookshop Broekhuis, where I spend almost an hour looking at the new arrives. When I noticed that the sun was about to set, I decided to go home, to enjoy the last light of the day while going home. On my way home, I took the following picture on the 'square' called Usselerplein, there where the Usselerweg ends at the Denneweg and continue into the Zweringweg (position in street view).
Friday, November 25, 2022
- How I over-engineered a Fast Fourier Transform for Arduino
- Gordon JC Pearce on GitHub
- The Resonant Tidal Evolution of the Earth-Moon Distance (On ArXiv)
Thursday, November 24, 2022
- Porting 58000 lines of D and C++ to jai, Part 0: Why and How
- Simulated invasion of an alien star, capture of Mars and Uranus
- Cfront releases
- Postmodernism for Rationalists
Wednesday, November 23, 2022
Palindrome date (DD-MM-YY and YY.MM.DD)Today is a palindrome date when written according to the DD-MM-YY format: 22-11-22 and the YY.MM.DD formats: 22.11.22. The previous such date was November 12, 2021 and the next will be November 3, 2030.
Patches of snowThis morning, when I biked to my office, I saw some patches of snow. I saw some layers of snow on some car roofs and from this I conclude that about 0.5 to 1cm of snow fell during the night. Only at the end of the night (after 5 o'clock) the temperature dropped below zero, reaching a temperature of -1.4° Celsius at Twenthe Airport. The night before the temperature dropped to -8.2° Celsius, which is not a record, but this rather exceptional. In the middle of the province Overijssel one weather station reported 4cm of snow.
InfiniteIn the past weeks, I have been working on trying to prove that it is indeed possible to create infinite irregular grids of squares and equilateral triangles. I wrote a program for manipulating vertex labeled graphs. The program constructs two vertex labeled graphs, calculates the product of these graphs, prunes any dead-ends, and checks that all edges in the original graphs is still represented in the product graph. If that is the case, it means that there is a matching between the two graphs (on the labels) such that for any infinite walk in one them, there is also a path in the other graph. Because the two labeled graphs are related to the edges of all possible sequences of triangles and squares, it proves that above and under any sequence.
Thursday, November 17, 2022
BookAt 16:06:24, I bought the book Limes atlas edited by Bernard Colenbrander, written in Dutch and published by 010 Publishers in 2005, ISBN:9789064505355, second-hand from Polynea (webshop) for € 75.00. (The book will be send to me through a package delivery service.)
15.3° CelsiusThe temperature at Twenthe Airport has gone up to 15.3° Celsius, which breaks the previous record of 14.9° on this date in 2015. This is the tenth warmest day record of this year. Below a picture that I took this morning of a Garden marigold (Calendula officinalis) flower, which I sowed on Sunday, April 10, 2022. The normal flowering periode is from may to november.
De Meer 1Conny and I visted Castellum Hoge Woerd were we saw the exhibition about De Meern 1, a 25 meter long Roman ship that sank due to an accident based on the fact that many tools and personal items were found in the area the cabin was located. A unique find and quite interesting. We also saw the exhibition Natuur in Eenvoud with sumi e painting by Martha Goedings and raku creamics by Anke van der Kwaak. We also visited the museum with many archaeological finds, but we did not find any information about the roman castellum, if it was indeed located at the location of the Castellum Hoge Woerd, which has the form and size of the castellums found in the Netherlands.
DOMunderThis morning, Conny and I, walked through some of the many alleys in Utrecht. We walked through the following (where the numbers in square brackets refer to the numbering used in Stegenboek, rapport en kaart):
- Ridderhofstad 
- Catherijnesteeg 
- Catharinatuinen [210A]
- Abraham Dolehof 
- Abraham Dolesteeg 
- Brandstraat 
- Zwaansteeg 
- Jacobsgasthuissteeg 
- Walsteeg 
- Schildershof [115A]
- Driehoek (to Mariahoek) 
- Mariagang 
At the end of the afternoon, the evening we visited bookshop Broese at the new location that they moved to. I was a bit disappointed. The shop felt very crowded and the amount of ramsj (sale of new, hard-to-sell books at reduced prices) has been reduced greatly and placed in a 'corner' of the shop. The exact science section of the bookshop had no books on math and physics, but did have a lot of management related books.
We had dinner at Silk Road, where we had dishes from Route 1: naan, zeitun, hummus, muhammara, murgh massale, kofte, tabouleh, bahar, and Route 2: naan lahasun, baba ganoush, hummus mazara, dahl, tajine, dopiazza gosala, salat mazara, kaeng kari kai, plov. We also had some desert. Although the dishes did not look large, it was still enough and definitely a very nice experience with a lot of interesting tasts.
We also walked through some alleys, the first two on the way to the restaurant. These are:
- Lauwersteeg 
- Jodenrijtje [79, 80]
- Massegast 
- Hekelsteeg 
- Hamsteeg 
- Drieharingstraat 
- Zakkendragerssteeg 
- Achter Clarenbrug 
- Wijdepoort (closed) 
- 1e Buurkerksteeg 
- 2e Buurkerksteeg 
- Buurkerkhof 
- 3e Buurkerksteeg 
- Donkerstraat 
- Kuipersteeg 
- Boterstraat 
- Lijnmarkt aan de werf [126, 127, 128]
Dutch water lineThis afternoon, Conny and I visited the Waterliniemuseum, which a museum is about the Dutch water lines, which by means of indundation were used by defend against attacks by foreign countries. The museum is inside the fort near Vechten. This fort is one of about fifthy that are part of the New Dutch Water Line, which was meant to defend the provinces North Holland, South-Holland, and the west part of Utrecht including the city Utrecht. The old water line did not include Utrecht.
Next, we visited Castellum Fectio, which is just west of the fort. It is part of the Limus Germanicus, the northern border of the Roman Empire and the unsubdued Germanic tribes. The next castellum (fort) to the west, is Traiectum, which is located in the center of Utrecht. The book Limes atlas has some interesting maps explaining the position of limes and the various Roman forts in the Netherlands.
We went to Utrecht were we are going to stay for two nights. On the way to a Greek restaurant, we visited the bookshop Steven Sterk. At 17:55, I bought the book Actie-Reactie: 100 jaar kinetische kunst written by Serge Lemoine, Marianne Le Pommeré, and Emily Ansenk, edited by Charlotte van Lingen, written in Dutch and published by Lannoo in 2018, ISBN:9789401456234, for € 12.50.
After having our dinner at the Greek restaurant in one of the wharfs at Oudegracht, we walked through the city center, looking at some of the light art works that are part of Utrecht Lumen. We visited:
- Ganzenmarkt tunnel
- Sint Willibrord Church
- Jams Light
- Drift Vaults
- Marking the Castellum Wall (off)
- Lights of Saint Peter's Church
BookAt 15:24:57, I bought the book Atlas van de wereldgeschiedenis: de geschiedenis van de mensheid in 515 kaarten written by Christian Grataloup, translated by Henriette Gorthuis from French into Dutch, published by Nieuw Amsterdam in 2020, ISBN:9789046827321, from bookshop Broekhuis for € 19.95.
Thursday, November 3, 2022
- Bell's theorem allows local theories of quantum mechanics
- Superdeterminism: A Guide for the Perplexed
Rijksmuseum TwentheThis afternoon, Conny and I visited Rijksmuseum Twenthe. We saw several exhibitions. We first went to see the exhibition Marinetti and Futurism: a manifesto for a new world, which is about Filippo Tommaso Marinetti and Futurism in Italy. Italian Futurism has some dark sides due to its support for Fascism. I found the following works noteworthy:
- Le Vers Libre, 1911, Filippo Tommaso Marinetti.
- Pessimism and optimism, 1923, Giacomo Balla.
- Portrait of F.T. Marinetti, 1915-1921, Rougena Zatkova.
- Portrait of a Woman, 1911, Umberto Boccioni
- Woman + Light + Ambiance, 1915, Enrico Prampolini.
- Interventionist demonstration / Virginity, 1915/1925, Giacomo Balla.
- Dynamic expansion + speed, 1913, Giacomo Balla.
- Iridescebt Interpretations, 1913, Giacomo Balla.
- Horse + Rider + Building, 1913-1914, Umberto Boccioni.
- Rumori Contemporain, 2020-2021, Peter Zegveld.
- Unique Forms of Continuity in Space, 1913, Umberto Boccioni.
- Thaïs (Film), 1917, Anton Giulio Bragaglia.
- Dynamics of Light Forms in Space, 1912, Gino Sererini.
- Dancer (Ballerina + Sea), 1913, Gino Sererini.
- Gunshot on a Sunday, 1918, Giacomo Balla.
- Impression of a bombardment with shells and shrapnel, 1926, Luigi Russolo.
- Racing Horses in the Clouds, 1924, Fortunato Depero
- The Gondelier, 1927, Fortunato Depero.
- The Race, 1925-1927, Gerardo Dottori
- Mechanical Reader and Embroiderer, 1921, Fortunato Depero.
- Racing Cars + Road, 1933, Giovanni Korompay.
- Drinker + Lamp, 1920, Roberto Marcello Baldessan.
- Female Nude, 1921, Roberto Marcello Baldessan.
- Tabac blond (perfum), 1919, Caron
- The smell of the bourgeoisie (perfume)
- Ozone (perfume), 1932.
- Eau de colongne (perfume)
- Fiori d'Italia - Aeroprofumi futuristi, 1942, Bruno Sanzin
- Car - Race - City, 1917, Roberto Marcello Baldessan.
- Spiralata, 1931, Tato
- Parched mountains of solitude, 1936, Benedetta Cappa Marinetti.
- Cosmic Motherhood, 1930, Enrico Prampolini
- The Two Eras, 1936, Ivanhoe Gambini.
- Change of course above the Gulf, 1925, Giulio D'Anna.
- Descending into the city from the sky, 1933, Alfredo Gauro Ambrosi.
- The Italian Lakes, 1937, Gerarolo Dottori.
- Falling Paratrooper, 1935, Renato Di Bosso.
- Nose Dive on the City, 1938, Tulio Crali.
Next we saw the exhibition Homo symbioticus with works from the collection selected by the Dutch author Atte Jongstra. The details about the works on display were printed on some sheets held together with a staple, but did not cover all the works on display. Incomplete list of the works I found noteworthy:
- Cirkel en zeshoek in overgang, 1966, Ad Dekkers.
- Minimal Music Piece, 1988, Peter Vogel. (Video of "Rhytmic Sounds".)
- Recreatiegebied #9, 2003, Renie Spoelstra.
- Frenhofer's leisure landscape, 1986, Willem Sanders.
- De muze is moe, 1994, Marlene Dumas.
- Atlas voor een steen (3×), 1979, Geert Jan van Oostende.
- Zonder titel (Change), 1979, Peter Struycken.
- Io, die de avances van Zeus afwees, heeft zojuist van Prometheus vernomen dat zij in een vaars zal worden veranderd, 1983, Ronald Tolman.
- Zwaanhals, 2006, Linda Molenaar.
- Metamorfoses (6×), 2021, Astrid van Rijn.
- Negen responsoria voor Carlo Gesualdo, Principe di Venosa, 1998, Frank van den Broeck.
Next we saw the Carlijn Kingma: The Waterworks of Money. I found the following works noteworthy:
- Allegory of Trade, 1585
- The Waterworks of Money, 2022, Carlijn Kingma.
- The Fabric of Huamnkind, 2020, Carlijn Kingma.
- The Objective Truth Factory, 2016, Carlijn Kingma.
- The Babylonian Tower of Modernity, 2017, Carlijn Kingma.
- A History of the Utopian Tradition, 2016, Carlijn Kingma.
We walked through the rest of the museum.
- Falaises près de Pourville, 1882, Claud Monet.
- Autumnal view of Louveciennes, 1872, Alfred Sisley.
- Thank you for hurting me. I really needed that…, (4×), 2005, Melanie Bonajo.
- Young woman in a pink blouse, Jan Sluiters
- Sitting nude (Eva), Jan Sluiters.
When walking back to the entrance through the corridor, we saw the exhibition The Setting of Violence: A photographic approach to Pier Paolo Pasolini's Saló o le 120 giornate di Sodoma (1975) by photographer and visual artist Rein Jelle Terpstra, which has editted frames from the film that show the many prominent futuristic paintings on the walls.
At 14:33, I bought the book 100 Artists' Manifestos: From the Futurists to the Stuckists edited by Alex Danchev, written in English and published by Penguin Adult in 2011, ISBN:9780141191799, from the museum shop for € 19.95.
61 yearsI was born on Wednesday, November 1, 1961 at 9:45 in the morning (CET). That means that today, I will be 61 years according to the calendar and 22280 days old. But how old am I really? The tropical year, the time that it takes for the seasons to return, is said to be 365 days, 5 hours, 48 minutes, and 45.19 seconds. Today, around 4:19 in the night, it was 61 tropical years since I was born. But the tropical year is shorter than the sidereal year, the time taken by the Earth to orbit the Sun once with respect to the fixed stars, namely 365 days, 6 hours, 9 minutes, and 9.76 seconds. That means that, tomorrow at 1:03:55 it will be 61 sidereal years after I was born. The average anomalistic year, the time taken for the Earth to complete one revolution with respect to its apsides, is 365 days, 6 hours, 13 minutes, and 52.6 seconds. That means that, tomorrow around 5:51:28 it will be 61 average anomalistic years since I was born.
22.1° CelsiusThe temperature at Twenthe Airport has gone up to 22.1° Celsius, which breaks the previous record of 21.3° on this date in 2005. At the end of the afternoon, Conny and I made a walked just in our shirts. The Overkill Festival. I looked around the exhibition. I liked the following art work, installations:
- UnearthU by Kara Stone
- A Funeral for Digital Data by Ginevra Petrozzi
- Mechanical Additive Synthesis by Jeannette Petrik and Jan Krühler
- Deep Planetary Sensing by Annika Kappner
- Sisters of the Wind by Juliette Lizette
- Glitch Bodies by Rebeca Merlic (Instagram). I played sometime with it visiting about half the 'worlds'.
- Inevitably Blue by Sophia Bulgakova. I participated in this installation. (Actually for the second time. The first time was on Sunday, July 7, 2019.)
- Ecosexual Bathhouse by Pony Express
- Marble Run by No Time
- Presenter Slides by 03gle.
22.7° CelsiusThe temperature at Twenthe Airport has gone up to 22.7° Celsius, which breaks the previous record of 21.3° on this date in 2005.
- An Artificial Neuron with a Leaky Fin-Shaped Field-Effect Transistor for a Highly Scalable Capacitive Neural Network
Thursday, October 27, 20220
Wednesday, October 26, 20220
Partial solar eclipseAt 12:32, Conny and I watched the partial solar eclipse.
Our whole house has Alzheimer'sI went to Amsterdam to attend the PhD defense of Silke Hoppe where she defended her thesis Our whole house has Alzheimer's. How early-onset dementia shapes relationships of families in the Netherlands. It was held in Agnietenkapel (Announcement in Dutch). I took a copy of the defense at the entrance. The recording of the defense including an introduction. The introduction brought back some of my own experience when we were a family with Alzheimer's. It made me also realize how I have dealt with and overcome those experiences and also how they shaped my personal development. I think that practicing some forms of active meditation and practice mantra singing (around 2016 to 2018) has been a part of this.
gi-dt-005I was wrong about what I wrote that gi-st-004 was not found by the program for finding regular irregular grids of squares and equilateral triangles, because it was. But I did find that gi-dt-005 was not generated the program. I spend some time finding the reason for this. It had to do with the method I used to limit the search space for patterns. I had put a limit on the lines between the rows of possible pieces such that each can only occur once in each of the directions. When I changed this to a restriction on the rows of the possible pieces in the program, the missing pattern was generated. (It has been added to the dedicated page.) I am not sure if now all possible patterns are generated.
- Methods for disentangling period and cohort changes in mortality risk over the twentieth century: comparing graphical and modelling approaches
Do Androids Dream of Electric Sheep?I finished reading the book Do Androids Dream of Electric Sheep? by Philip K. Dick, which I started reading on October 12 after I bought it on September 14. I found this book quite interesting and enjoyed reading it. The book is deeper than the film Blade Runner, which based on this book.
Grid IndexThis weekend, I had a look at the book Grid Index, which I received on Saturday, April 2, 2022 and which started me thinking about irregular grids of squares and equilateral triangles. I wanted to see if I could match the grids shown in the book, with the grids by the program irst.cpp that I wrote before and wrote about for the last time on Thursday, August 18. I quickly found an example of a grid, gi-st-004, that is not generated by the program. I decided to create a separate page about matching the grids with the results of the program.
Going into the cityAt Fotogalerie Objektief, I saw the exhibition On the Road by Bert Teunissen. I went to bookshop Broekhuis where I was met with a lot of parents with their children, some of which appeared not have been in the bookshop for a long time. This was due to the childrens book week, where you get a free book when you spend € 12.50 on children books. At 15:37:01, I bought the book Dagboek 1972 written by Jan Wolkers in Dutch and published by De Bezige Bij in 2007, ISBN:9789023425342, from for € 9.95.
- Mindfulness-induced endogenous theta stimulation occasions self-transcendence and inhibits addictive behavior
- Fractal Texturing