Set function by Ciro Santilli 35 Updated +Created
This section is about functions that operates on arbitrary sets.
Spark-gap transmitter by Ciro Santilli 35 Updated +Created
The first type of device that allowed sending Morse code without wires, as opposed to the wired electrical telegraph that previously existed.
Naval communications was one of the first major applications, as you can't have wires on boats!
Wireless voice transmission came about with modulation.
Video 1.
Spark-gap transmitter at the at the The Museum of Radio and Technology Jeri Ellsworth (2017)
Source.
Video 2.
Marconi Spark Gap Transmitter Demonstration by Canada Science and Technology Museum (2012)
Source.
Transmitter by Ciro Santilli 35 Updated +Created
History of radio by Ciro Santilli 35 Updated +Created
Synagogue by Ciro Santilli 35 Updated +Created
Fax by Ciro Santilli 35 Updated +Created
Uses telephone lines, and therefore were still usable much much after the Internet made them obsolete, which is quite funny.
Video 1.
Teletype ASR 33 Part 10: ASR 33 demo by CuriousMarc (2020)
Source.
Video 2.
Fax Machine by Museum of Obsolte Objects (2011)
Source.
GNU screen by Ciro Santilli 35 Updated +Created
Most important things to know:
  • kill window: Ctrl + A K
Telex by Ciro Santilli 35 Updated +Created
Not a telephone-based system, needing its own network, and was killed particularly by fax which is. Telex evolved from the Telegraph, which is a binary system at the physical layer.
Video 1.
Siemens T1000 Fernschreiber by dragonforces (2015)
Source.
Everything can break everything by Ciro Santilli 35 Updated +Created
Whenever someone asks:
I can only see this one thing different our setups, do you think it could be the cause of our different behaviour?
you don't need to read anymore, just point them to this page immediately. Virtualization for the win.
y86.js.org by Ciro Santilli 35 Updated +Created
The good:
  • slick UI! But very hard to read characters, they're way too small.
  • attempts to show state diffs with a flash. But it goes by too fast, would be better if it were more permanent
  • Reverse debugging
The bad:
  • educational ISA
  • unclear what flags mean from UI, no explanation on hover. Likely the authors assume knowledge of the Y86 book.
Country in Oceania by Ciro Santilli 35 Updated +Created
Morse code by Ciro Santilli 35 Updated +Created
ASCII by Ciro Santilli 35 Updated +Created
Vaporware by Ciro Santilli 35 Updated +Created
One of the saving graces of open source is that you ship shit, but you don't announce vaporwave.
Qualcomm by Ciro Santilli 35 Updated +Created
Ciro Santilli has always had a good impression of these people.
Tesla Dojo by Ciro Santilli 35 Updated +Created
SQL READ COMMITTED isolation level by Ciro Santilli 35 Updated +Created
Example where this level is sufficient: nodejs/sequelize/raw/parallel_update_async.js.
Random-access memory by Ciro Santilli 35 Updated +Created
In conventional speech of the early 2000's, is basically a synonym for dynamic random-access memory.
Fungus by Ciro Santilli 35 Updated +Created
Formal name: "fungi".

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!
Video 1.
Intro to OurBigBook
. Source.
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
    Video 2.
    OurBigBook Web topics demo
    . Source.
  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:
    • to OurBigBook.com to get awesome multi-user features like topics and likes
    • as HTML files to a static website, which you can host yourself for free on many external providers like GitHub Pages, and remain in full control
    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.
    Video 4.
    OurBigBook Visual Studio Code extension editing and navigation demo
    . Source.
  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