Eric W. Weisstein by Ciro Santilli 37 Updated +Created
Ahh, this dude is just like Ciro Santilli, trying to create the ultimate natural sciences encyclopedia!
In 1995, Weisstein converted a Microsoft Word document of over 200 pages to hypertext format and uploaded it to his webspace at Caltech under the title Eric's Treasure Trove of Sciences.
Erhu by Ciro Santilli 37 Updated +Created
Figure 1.
A blind erhu street performer playing in Jingzhou, Hubei (2006)
Source. Playing the erhu is a traditional occupation for blind people in China, a notable example being Abing.
Video 1.
Suwu herding sheep played by Song Fei (2017)
Source.
Video 2.
The 12 Most Famous Erhu Melodies in China (2021)
Source. TODO transcribe list.
William Compston by Wikipedia Bot 0
William Compston could refer to a specific individual, but it appears that there isn't a widely recognized or notable figure by that name in public records, literature, or media up to October 2023. It’s possible that he could be a private individual, a fictional character, or someone emerging in prominence after my last update.
In New South Wales (NSW), Australia, "big things" typically refer to large, often quirky monuments or structures that are tourist attractions throughout the state. Here are some notable examples: 1. **The Big Banana** - Located in Coffs Harbour, it's one of the first and most famous big things in Australia. It features a banana-themed park with attractions like water slides and a mini-golf course.
Western Australia is known for several "big things" that are popular tourist attractions. These oversized structures often celebrate local culture, industry, or natural features. Here are some of the notable "big things" in Western Australia: 1. **The Big Banana** - Located in Coffs Harbour, although not technically in Western Australia, it is a well-known example of the "big things" phenomenon found throughout Australia.
Erdős' conjecture on powers of 2 by Ciro Santilli 37 Updated +Created
Described at: arxiv.org/pdf/2107.12475.pdf where a relation to the Busy beaver scale is proven, and the intuitive relation to the Collatz conjecture described. Perhaps more directly: demonstrations.wolfram.com/CollatzSequenceComputedByATuringMachine/
The Australian Capital Territory (ACT) is known for several notable attractions, landmarks, and features. Here are some of the "big things" associated with the ACT: 1. **Canberra**: As the capital city of Australia, Canberra is central to the country's politics and culture. It is home to important national institutions.
Chemical equilibrium by Ciro Santilli 37 Updated +Created
Erase SSD securely by Ciro Santilli 37 Updated +Created
You can't just shred individual sSD files because SSD writes only at large granularities, so hardware/drivers have to copy stuff around all the time to compact it. This means that leftover copies are left around everywhere.
What you can do however is to erase the entire thing with vendor support, which most hardware has support for. On hardware encrypted disks, you can even just erase the keys:
TODO does shredding the
Spectrum auction by Wikipedia Bot 0
A spectrum auction is a process used by governments or regulatory authorities to allocate radio frequency spectrum rights to telecommunications companies and wireless service providers. Radio frequency spectrum is a limited natural resource that enables wireless communication, including mobile phone services, radio and television broadcasting, and various forms of wireless data transmission.
enwiki-latest-category.sql by Ciro Santilli 37 Updated +Created
dumps.wikimedia.org/enwiki/latest/enwiki-latest-category.sql.gz contains a list of categories. It only contains the categories and some counts, but it doesn't contain the subcategories and pages under each category, so it is a bit pointless.
The SQL first defines the table:
CREATE TABLE `category` (
  `cat_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `cat_title` varbinary(255) NOT NULL DEFAULT '',
  `cat_pages` int(11) NOT NULL DEFAULT 0,
  `cat_subcats` int(11) NOT NULL DEFAULT 0,
  `cat_files` int(11) NOT NULL DEFAULT 0,
  PRIMARY KEY (`cat_id`),
  UNIQUE KEY `cat_title` (`cat_title`),
  KEY `cat_pages` (`cat_pages`)
) ENGINE=InnoDB AUTO_INCREMENT=249228235 DEFAULT CHARSET=binary ROW_FORMAT=COMPRESSED;
followed by a few humongous inserts:
INSERT INTO `category` VALUES (2,'Unprintworthy_redirects',1597224,20,0),(3,'Computer_storage_devices',88,11,0)
which we can see at: en.wikipedia.org/wiki/Category:Computer_storage_devices
Se see that en.wikipedia.org/wiki/Category:Computer_storage_devices_by_company
so it contains only categories.
We can check this with:
sed -s 's/),/\n/g' enwiki-latest-category.sql | grep Computer_storage_devices
and it shows:
(3,'Computer_storage_devices',88,11,0
(521773,'Computer_storage_devices_by_company',6,6,0
There doesn't seem to be any interlink between the categories, only page and subcategory counts therefore.
Equipartition theorem by Ciro Santilli 37 Updated +Created
enwiki-latest-categorylinks.sql by Ciro Santilli 37 Updated +Created
Competitive equilibrium refers to a state in an economic market where supply equals demand, and no individual buyer or seller can influence the market price. In this scenario, the prices of goods and services are determined by the interplay of supply and demand, and every participant (consumers, firms, etc.) in the market makes choices that maximize their utility (consumers) or profits (producers) given the existing market prices.
Envelope (music) by Ciro Santilli 37 Updated +Created
Entropy of a chemical reaction by Ciro Santilli 37 Updated +Created
Types of auction by Wikipedia Bot 0
There are several types of auctions, each with its own set of rules and procedures. Here are some of the most common types: 1. **English Auction**: This is the most common auction type, where the auctioneer starts with a low price and participants bid higher amounts until no one is willing to bid further. The item is sold to the highest bidder.
The transition dipole moment is a fundamental concept in quantum mechanics and spectroscopy, particularly in understanding the interaction of light with matter. It describes the probability of a transition between two quantum states of a system (such as an atom or a molecule) when it is subjected to an external electromagnetic field, such as light.

Pinned article: ourbigbook/introduction-to-the-ourbigbook-project

Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
We have two killer features:
  1. topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculus
    Articles of different users are sorted by upvote within each article page. This feature is a bit like:
    • a Wikipedia where each user can have their own version of each article
    • a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
    This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
    Figure 1.
    Screenshot of the "Derivative" topic page
    . View it live at: ourbigbook.com/go/topic/derivative
  2. local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:
    This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
    Figure 5. . You can also edit articles on the Web editor without installing anything locally.
    Video 3.
    Edit locally and publish demo
    . Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension.
  3. https://raw.githubusercontent.com/ourbigbook/ourbigbook-media/master/feature/x/hilbert-space-arrow.png
  4. Infinitely deep tables of contents:
    Figure 6.
    Dynamic article tree with infinitely deep table of contents
    .
    Descendant pages can also show up as toplevel e.g.: ourbigbook.com/cirosantilli/chordate-subclade
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact