Rachel Scherr is an accomplished physicist noted for her work in the field of physics education and research. She has contributed significantly to improving the way physics is taught, particularly in terms of creating effective educational strategies and understanding how students learn physics concepts. Her research often focuses on the use of active learning and inquiry-based instructional methods.
Norman Ramsey Jr. was an American physicist known for his significant contributions to the field of atomic physics and quantum mechanics. Born on August 27, 1915, he won the Nobel Prize in Physics in 1989 for his work on the development of methods for the precise measurement of molecular beams and for pioneering techniques in atomic clocks. Ramsey's work has had a profound impact on the fields of metrology and the development of technologies such as GPS, which rely on precise timing measurements.
As of my last knowledge update in October 2023, there is no widely recognized figure or term known as "Paulett Liewer." It's possible that it could refer to a private individual, a local figure, or something that has gained significance after my last update.
Peter Westervelt is an American entrepreneur and educator, primarily known for his work in the online business and digital marketing space. He has been involved in various ventures and initiatives aimed at helping individuals and small businesses succeed in the digital world. His methods often focus on leveraging technology and innovative strategies to maximize business growth. Beyond entrepreneurship, he may be engaged in creating educational content, workshops, or resources designed to teach digital marketing and online business strategies.
Rama Bansil is a popular Indian snack made from puffed rice (also known as murmura or kurmura) that is typically mixed with a variety of savory ingredients such as peanuts, roasted lentils, spices, and sometimes dried fruits. It is often enjoyed as a light snack or a quick breakfast option and is known for its crunchy texture and flavorful seasonings.
As of my last update in October 2021, Robert Fontana is a prominent figure in the field of hepatology, particularly known for his research on liver diseases and transplantation. He has contributed significantly to the understanding of liver-related conditions and their treatment.
Rebecca Thompson could refer to different individuals depending on the context, as it is a relatively common name. Without additional context, it's difficult to determine exactly who you might be referring to. For instance, Rebecca Thompson could be a professional in various fields such as literature, academia, science, or even a character in a book or film.
As of my last update, there is no widely recognized public figure, event, or concept specifically named "Rhonda Stroud." It's possible that Rhonda Stroud could refer to a private individual or a less-known figure in specific fields such as academia, business, or local news. If you can provide more context or details, I might be able to assist you better. Otherwise, please check the latest sources for the most current information.
Richard A. Webb could refer to various individuals, as it is a relatively common name. Without additional context, such as a specific field (like science, literature, academia, etc.) or notable works, it is difficult to pinpoint exactly who you might be referring to. If you provide more details or context surrounding Richard A.
This section is about groups of ordinal ruleset inscription that share a theme and were presumably created by a single entity.
These were found by running object detection software for some porn/nudity detection. We need to run some more, all sex was likely missed: github.com/GantMan/nsfw_model/issues/160
Skew-symmetric matrix by Ciro Santilli 40 Updated 2025-07-16
WTF is a skew? "Antisymmetric" is just such a better name! And it also appears in other definitions such as antisymmetric multilinear map.
Change of basis matrix by Ciro Santilli 40 Updated 2025-07-16
The change of basis matrix is the matrix that allows us to express the new basis in an old basis:
Mnemonic is as follows: consider we have an initial basis . Now, we define the new basis in terms of the old basis, e.g.:
which can be written in matrix form as:
and so if we set:
we have:
The usual question then is: given a vector in the new basis, how do we represent it in the old basis?
The answer is that we simply have to calculate the matrix inverse of :
That is the matrix inverse.

Pinned article: 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 2.
    You can publish local OurBigBook lightweight markup files to either https://OurBigBook.com or as a static website
    .
    Figure 3.
    Visual Studio Code extension installation
    .
    Figure 4.
    Visual Studio Code extension tree navigation
    .
    Figure 5.
    Web editor
    . 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