Friday, January 28, 2022
Book
At 17:31, I collected the book Cain's Jawbone written by Edward Powys Mathers in English and published by Unbound in 2021, ISBN:9781800180796, which I had bought on Tuesday, January 18, 2022 at 10:22 from bookshop Broekhuis for € 14.95.Thursday, January 27, 2022
Buning - Djokja
I discovered that the edition of Ulysses that I bought yesterday is much more worth than what the half Euro I paid for it. I do not have the first volume. The two volumes together are worth about € 50.00. On the first title page it has a round paper sticker with the words 'Buning' and 'Djokja'. This could be a bookstore label of a Buning bookshop in Yogyakarta. Some simalar bookstore labels can be found on the (Dutch) page Librariana Deel 28 (2011) / Boek- en leescultuur in Nederlands Indië by Lisa Kuitert. But it could also be some personal label, because it is also found on the back of a watercolour Javanese scene by the artist Jan Christiaan Poortenaar. Anyway, it looks like the book has been in Yogyakarta. I wonder how it arrived her in Enschede.Wednesday, January 26, 2022
Books
At 12:15, I bought the following books from charity shop Het Goed:- Ulysses: [in Two Volumes]., Volume 2 written by James Joyce in English and published by The Odyssey Press in 1932 for € 0.50.
- De vijfde lijn written by Steven Aalders and Robert van Altena, illustrations by Peter Cox, written in Dutch and published by Prometheus in 2017, ISBN:9789044634204, for € 3.95.
- Sex at Dawn: How We Mate, Why We Stray, and What It Means for Modern Relationships written by Christopher Ryan and Cacilda Jetha in English and published by HarperCollins in 2011, ISBN:9780061707810, for € 2.85.
Link
Tuesday, January 25, 2022
22,000
Today, I am 22,000 days old. I have decided to celebrate this day on a smaller scale than the day I was 20,000 days old. I have bought some tompouce for us and some stroopwafels to treat my colleagues tomorrow when I will be in the office again.Addition: A colleague of mine suggested the term kilo days.
Links
Monday, January 24, 2022
INTP
I made the test at 16 Personalities and according to the test I am a INTP with the following details: 72% introvert, 63% intuitive, 59% thinking, 57% prospecting, and 51% assertive. This matches with what I concluded on August 16, 2002. It looks like this test is a range version of the Myers–Briggs Type Indicator, which has been critized that there is little evidence for dichotomies.Sunday, January 23, 2022
Border poles
This afternoon, Conny and I continued our search for border poles. We first visited Dutch trigonometric point 299308 which is located at X-RD 266010.3554 Y-RD 485167.1394 52° 20' 35.47425" North, 7° 00' 58.74302" East. We found it at 14:27. We look around the area before going to the border. There we encountered the following border poles:- At 15:04, pole 32.
- At 15:12, pole 32-I.
- At 15:16, pole 32-II.
- At 15:19, pole 32-III.
- At 15:39, pole 43 (N) and pole 43 (D).
- At 15:42, pole 42.
- At 15:44, pole 41-III.
- At 15:45, poles 41-II and 41-I.
- At 15:48, pole 41.
- At 15:51. pole 40.
- At 15:55, pole 39.
- At 16:14, pole 44 (D).
- At 16:15, pole 44 (N).
Saturday, January 22, 2022
Palindrome date
Today is a palindrome date when written according to the D(D)-M(M)-YY format: 22-11-22 and the YY.(M)M.(D)D formats: 22.1.22. The previous such date was November 12, 2021.Fotocollectief Photophever
This afternoon, I visited Bookshop Broekhuis where at the top floor, I saw the exhibition from Fotocollectief Photophever. I liked some of the pictures by Marek Hardens.Monday, January 17, 2022
Book
Last Saturday, the lock-down with respect to non-essential shops came to an end. This morning, I could not resist my urge to visit charity shop Het Goed on my way to the office. At 10:10, I bought the following books:- De Pythagoras Code: het beste uit een halve eeuw wiskunde voor liefhebbers written by Alex van den Brandhof and A.J. Brandhof in Dutch and published by Bert Bakker in 2011, ISBN:9789035136465, for € 4.05.
- Architektur der Welt: Maya, Guatemala, Honduras, Yukatan, Volume 8 written by Henri Stierlin in German and published by Taschen in 1964 for € 2.75.
- Architektur der Welt: Das alte Mexiko, Volume 2 written by Henri Stierlin written in German and published by Taschen in 1967 for € 2.75.
Sunday, January 16, 2022
Border poles
It is since last year September 2 that Conny and I went looking for border poles. This afternoon, we continued our search. We were surprised to find several border poles that we missed last year as they were clearly visible now. For sure the amount of overgrowth is much less than in the four months ago. (I had entered the location of the border poles we wanted to find in a GPX file and unloaded it to my Galaxy Tab 3 tablet.) We encountered the following border poles:- At 14:14, pole 25.
- At 14:21, pole 24-II.
- At 14:28, pole 26 (again).
- At 14:48, pole 26-V.
- At 14:54, pole 27 (again).
- At 14:58, pole 28.
- At 15:04, pole 29 (again).
- At 15:08, pole 30.
- At 15:13, pole 31 (again).
- At 15:15, pole 31-I (again).
- At 15:21, pole 31-II.
- At 15:25, pole 31-III.
Link
Saturday, January 15,2022
Links
- Open Infrastructure Map
- HoogspanningsNet (Dutch)
- Reverse engineering Turing Machines and insights into the Collatz conjecture by John Nixon
- YACAS: Yet Another Computer Algebra System
Friday, January 14, 2022
2-state 4-color BLB
Last Wednesday, I read the blog Another New Record in Self-Cleaning Turing Machines, which is about a new record breaking 2-state 4-color Turing Machine that is a Blanking Beaver, a kind of Busy Beaver. In the past two days, I have been trying to analyze it. This evening, I found that it calculates the following Collatz like sequence:
n = 1; m = 1;
while (true)
if ((n % 2) == 1)
{
if (m == 2)
n = 1;
else
n = 2 + 5 * (n + m) / 2;
m = 1;
}
else
{
n = 1 + 5 * n / 2;
m++;
}
The steps it took me to find this can be found in this
program. I started with an interpretting implementation for the Turing
machine using a compressed representation of the tape. The idea that in case
a number of cells are given the same 'colour' (symbol) to represent it as a
single cell with a number representing the count. The implementation is found
in the function interpretter. I ran this to get an idea of the
patterns that occured. At one point, I replaced the count (in the printout)
by a star character and discovered some repeating patterns. I decided to
write a version where the turing machine is hard code. See the function
hard_coded1. At one point, I made it print out the transitions from
state with colour under the head to next state and next colour under the head.
This showed that there were only a limited number of transitions. I used this
to construct the function hard_coded2 where they are shown in the
comments. I added labels for all state-colour combinations and a goto
statements for the transistions. In the function hard_coded3 I
reordered the statements such that state-colour combinations that often
occured to follow each other appeared below each other. I also added
while-loops for repeating state-colour combinations, which I rewrote in a
more compact form. (The while-loops can be found as comments in the code.)
This resulted in less output to be printed, but I took care that the lines in
the input still matched those generated with the earlier functions, to make
sure I had not introduced errors. I studied the output and noticed some
repeating patterns. This lead to the implementation of hard_coded4
function that tries to reimplement the behaviour starting from the 'A'-state,
'0'-colour combination. I already had noticed that there was a slight
difference depending on the number of ones on the left tape were odd or even.
(It took me some effort to get the number of intermediates steps calculated
correctly.) However, it did not result in the expected cleaning of the tape.
This lead to the development of the function hard_coded5 which does
not make a difference between whether the number of ones is odd or even, but
stops a little earlier. Now it did produce the expected cleaning of the tape
(not exactly). Through analyzing the output produced by this function, I
wrote the calc function, which is also shown above. The calculation
of the n variable is derived from the code of hard_coded5 and
the calculation of the m variable is based on analyzes of the output.
Link
Wednesday, January 12, 2022
Links
- Another New Record in Self-Cleaning Turing Machines
- Idris: A Language for Type-Driven Development
- Answers to Questions about Chinese Characters and Dictionaries
Tuesday, January 11, 2022
Tropy
I have been looking at the Tropy application to see if I could use it for my research on Peter Struycken. It has some interesting features. It allows you organize your images and allows you to add meta data and notes to these, including selections of them. You can export the data as JSON and the notes are stored with a subset of HTML, which makes it possible to parse them. I want to extract data from the images and have a way to relate, to correlate, and to condens them into well established and supported facts. I also want to go from the facts back to the data and the images they are based on. It seems that Tropy does not support this. This afternoon, I discovered that it is possible to define templates and base these on all kinds ontologies. I had some look at Linked Open Vocabularies and the GND ontology. These are based on Resource Description Framework. (On Hacker News there was some discussion about the semantic web.) I find this model a little limited and rather cumbersome to work with. I thinking about representing the data in the images with (nested) bullet lists in the notes and write some software to extract these.Link
Friday, January 7, 2022
Paintings and such
Today, we spend some time cleaning the former home of my mother now that we are in the process of selling the house. I took some paintings and objecs with me. Among them:- Painting of a brook between trees, signed with 'H Kooy'.
- Still life paiting with fan.
- Painting of a bridge by a brother of my mother.
- Print Stadhuis Woerden 48/50I in frame.
- Framed picture Woerden: R.K.kerk en kasteel vanaf de toren Petruskerk.
- Cupper bowl with fish design.
- Print of Chinese ink painting with proverb sealed in some plastic.
- Bredemijer teapot.
- Two wooden egg cups.
- hourglass.
- Package with ten pairs of bamboe shopsticks. Made in Taiwan.
- Fan from China.
- Iron on beads figure made by Annabel.
- Pen in the form of an injection tube.
- Extension cord.
- Some spices.
- Glass marble that I started to carry in my pocket.
Wednesday, January 5, 2022
Memory upgrade
I got a 2Gbyte DDR3 SDRAM memory module from a fellow TkkrLab member and installed it in FJF2 following the YouTube video How to upgrade ram of Acer Aspire One D270. Easy! Do it yourself. I ran some memory test to check the memory module before closing it. Reconnecting the keyboard (twice) was the hardest part.Tuesday, January 4, 2022
Link
Sunday, January 2, 2022
Links
Saturday, January 1, 2022
13.5° Celsius
The temperature at Twenthe Airport has gone up to 13.5° Celsius, which breaks the previous record of 12.9° on this date in 2012.Friday, December 31, 2021
Brewing the Sublime
I finished reading the book Brewing the Sublime by Philip Vermeulen which I started reading two days ago, and which I bought earlier this month on the second. It is a small book with a lot of interesting notes with links. There is not an online version with the links. I started my own list:- Sane man by Bill Hicks
- Beyond the Finite: The Sublime in Art and Science
by Roald Hoffmann and
Iain Boyd Whyte
(more)
13.8° Celsius
The temperature at Twenthe Airport has gone up to 13.8° Celsius, which breaks the previous record of 13.7° on this date in 2017. But what is more remarkable is that that temperature was reached two times during last night. The temperature did not drop below 12.5° Celsius.Thursday, December 30, 2021
14.1° Celsius
Today, Conny and I went for a walk from our home. We did not know whether it would started to rain, so we did not plan to make a long walk at first. But while walking, we decided to go further, because it did not look like it was going to rain and the weather felt warm. At some point, we realized we had dressed ourselves too warm. At home I discovered that during out walk, the temperature at Twenthe Airport had gone up to 14.1° Celsius, which breaks the previous record of 13.0° for the temperature on this date in 1925. This is probably going to be our last walk for this year. Although there is a ban on fireworks this year, we still expect that a lot of illegal fireworks will be ignited tomorrow during the day and the night.Tuesday, December 28, 2021
Link
Saturday, December 25, 2021
Advent of Code 2021
This evening, I finished all the puzzles of Advent of Code 2021. My programs can be found in this github repository:. I was the 5774th person to finish all the puzzles. Up to and including Thursday, I woke up early every day to compete in the contest against my colleagues. About thirthy of them started out and were about five others still running in the competition. However, on Thurday, I realized that I was taking it far too seriously and I decided to quit the competition with my colleagues, removing myself from the private leaderboard. In the evening, I managed to finish the puzzles of Thursday. Yesterday, I spend at least half of my hours being awake and a some hours into the night to work on yesterdays puzzle without being able to finish the puzzle. Today around noon, I had a quick look at todays puzzle, which did not look so hard. But it was only around nine in the evening that I continued working on the puzzles and managed to finish yesterdays puzzle and todays puzzle (only one). This years winner is Brian Chen with the alias betaveros. On second place is Andrew He.Wednesday, December 22, 2021
Palindrome date and double date
Today is a palindrome date when the date is written in the format MM/DD/YY: 12/22/21, and a double date when written in the format DD-MM-YY: 22-12-21.Tuesday, December 21, 2021
Links
- Does Superdeterminism save Quantum Mechanics? Or does it kill free will and destroy science?
- Rethinking Superdeterminism
