Four-gradient Updated 2025-07-16
Metabolic pathway Updated 2025-07-16
Some notable examples:
Sitare Foundation Updated 2025-07-16
Special linear group of dimension 2 Updated 2025-07-16
University spin-off company Updated 2025-07-16
Apache License Updated 2025-07-16
Aperiodic monotile Updated 2025-07-16
Aperiodic tiling Updated 2025-07-16
Doing physics means calculating a number Updated 2025-07-16
It does not matter how, if it is exact, or numerical, or a message from God: a number has to come out of the formulas in the end, and you have to compare it with the experimental data.
Many theoretical physicists seem to forget this in their lectures, see also: Section "How to teach and learn physics".
How Ciro Santilli manages to write so much Updated 2025-07-16
- Suck at your job:
- Have bad memory so you have to take notes: Ciro Santilli's bad old event memory
- Be a compulsive knowledge hoarder: Ciro Santilli's knowledge hoarding
- Seek glory over money: Ciro Santilli's selfish desires
- Try to make a carrier out of it: OurBigBook.com
- Be born compassionate: Ciro Santilli's self perceived compassionate personality
- He doesn't actually write that much, but when he does he focuses on higher impact stuff, see remarks about "He doesn't like to refresh the homepage looking for easy reputation" on Section "Ciro Santilli's Stack Overflow contributions"
- Contribute in a place where it is super easy for people to give you upvotes if they like your stuff. This way, you will see the uploads, and that will motivate you to re-read your content and make it more perfect with additions and corrections.
Personal knowledge instance Updated 2025-07-16
SQL RECURSIVE prevent infinite recursion Updated 2025-07-16
Example under: nodejs/sequelize/raw/tree.js
SQL SERIALIZABLE isolation level Updated 2025-07-16
Aberration (astronomy) Updated 2025-07-16
Finite special general linear group Updated 2025-07-16
Just like for the finite general linear group, the definition of special also works for finite fields, where 1 is the multiplicative identity!
Note that the definition of orthogonal group may not have such a clear finite analogue on the other hand.
Mathematics illustration software Updated 2025-07-16
Survey by Ciro Santilli: math.stackexchange.com/questions/1985/software-for-drawing-geometry-diagrams/3938216#3938216
Many plotting software can be used to create mathematics illustrations. They just tend to have more data-oriented rather than explanatory-oriented output.
SPARQL tutorial Updated 2025-07-16
In this tutorial, we will use the Jena SPARQL hello world as a starting point. Tested on Apache Jena 4.10.0.
Basic query on rdf/vcard.ttl RDF Turtle data to find the person with full name "John Smith":Output:
sparql --data=rdf/vcard.ttl --query=<( printf '%s\n' 'SELECT ?x WHERE { ?x <http://www.w3.org/2001/vcard-rdf/3.0#FN> "John Smith" }')---------------------------------
| x |
=================================
| <http://somewhere/JohnSmith/> |
---------------------------------To avoid writing Output:
http://www.w3.org/2001/vcard-rdf/3.0# a billion times as queries grow larger, we can use the PREFIX syntax:sparql --data=rdf/vcard.ttl --query=<( printf '%s\n' '
PREFIX vc: <http://www.w3.org/2001/vcard-rdf/3.0#>
SELECT ?x
WHERE { ?x vc:FN "John Smith" }
')---------------------------------
| x |
=================================
| <http://somewhere/JohnSmith/> |
---------------------------------Bibliography:
- UniProt contains some amazing examples runnable on their servers: sparql.uniprot.org/.well-known/sparql-examples/
First block not mined by Satoshi Updated 2025-07-16
Mathy Magic: The Gathering thoughts Updated 2025-07-16
In 2019, a paper proved that MTG is Turing complete with a legacy legal deck. Live demo with some hand waving: Video "I Built a COMPUTER in Magic: The Gathering by Because Science (2019)". As Ciro Santilli comments at: github.com/cirosantilli/cirosantilli.github.io/issues/42 this was an interest addition to the previous "indefinite infinite loop" e.g. as found in a Four Horsemen combo deck
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