Lists of asteroids typically refer to the various catalogs and databases that document the asteroids discovered in our solar system. These lists can include a wide range of information about each asteroid, such as its designation number, name, size, orbital characteristics, and sometimes other data such as composition and surface features. Some of the notable lists and catalogs include: 1. **Main Belt Asteroids**: A list of asteroids primarily located in the asteroid belt between Mars and Jupiter.
Poincaré group by Ciro Santilli 37 Updated 2025-07-16
In simple and concrete terms. Suppose you observe N particles following different trajectories in Spacetime.
There are two observers traveling at constant speed relative to each other, and so they see different trajectories for those particles:
Note that the first two types of transformation are exactly the non-relativistic Galilean transformations.
The Poincare group is the set of all matrices such that such a relationship like this exists between two frames of reference.
Translation group by Ciro Santilli 37 Updated 2025-07-16
This is a good and simple first example of Lie algebra to look into.
Take the group of all Translation in .
Let's see how the generator of this group is the derivative operator:
The way to think about this is:
So let's take the exponential map:
and we notice that this is exactly the Taylor series of around the identity element of the translation group, which is 0! Therefore, if behaves nicely enough, within some radius of convergence around the origin we have for finite :
This example shows clearly how the exponential map applied to a (differential) operator can generate finite (non-infinitesimal) Translation!
Physics from Symmetry by Jakob Schwichtenberg (2015) page 66 shows one in terms of 4x4 complex matrices.
More importantly though, are the representations of the Lie algebra of the Lorentz group, which are generally also just also called "Representation of the Lorentz group" since you can reach the representation from the algebra via the exponential map.
Cardano by Ciro Santilli 37 Updated 2025-07-16
This was getting very hot as of 2022 for some reason. Would be good to understand why besides the awesome name.
Vacuum evaporation is a physical process used to separate or purify substances by utilizing low pressure (a vacuum) to lower the boiling point of the liquid being evaporated. This technique is widely used in various industrial applications, including: 1. **Concentration**: For concentrating solutions, commonly in the food and chemical industries. For example, it is used to concentrate fruit juices or liquid flavors without altering their properties significantly due to high temperatures.
Vanguarda Paulista refers to a significant artistic and cultural movement in Brazil that emerged in the 1950s and 1960s, particularly in the context of São Paulo's modernist scene. It encompasses various forms of expression, including literature, visual arts, music, and theater. The movement sought to break away from traditional Brazilian artistic conventions and was characterized by experimentation, innovation, and a focus on contemporary themes.
Hidden variables refer to unobserved or latent factors that are not directly measured in a study or experiment but may influence the behavior or outcomes of the observed variables. In various fields, the concept of hidden variables is crucial for understanding underlying mechanisms, causality, and the relationships between different phenomena.
In computer science, a variable is a symbolic name associated with a value and a storage location in memory. Variables are used to store data that can be manipulated during a program's execution. They allow programmers to write flexible and dynamic code by modifying the data contained in these variables as the program runs. Key characteristics of variables include: 1. **Name**: Each variable has a unique identifier (name) that is used to reference it in the code.
Venus has a diverse array of geological features that provide insight into its geological history and processes. Here’s a list of notable geological features found on Venus: 1. **Volcanic Features**: - **Shield Volcanoes**: Large, broad volcanic features like Maat Mons. - **Pancake Domes**: Gently rolling volcanic features formed by lava flows, such as those found in the Ovda Regio and Themis Regio areas.
Environmental virtue ethics is a philosophical approach that emphasizes the importance of character and virtue in understanding and addressing environmental issues. Unlike more traditional ethical frameworks that focus primarily on rules (deontological ethics) or consequences (utilitarianism), virtue ethics centers on the role of moral agents and their character traits in determining ethical behavior. Key components of environmental virtue ethics include: 1. **Character Development**: This approach emphasizes cultivating virtues such as respect for nature, humility, interconnectedness, and sustainability in individuals.
Reverence is a complex emotion characterized by a deep respect and admiration for someone or something considered sacred, significant, or worthy of honor. It often encompasses feelings of awe, humility, and veneration. Reverence can be directed toward various subjects, including religious figures, nature, art, cultural traditions, or even ideals and principles. In religious contexts, reverence may manifest as a profound respect for deities or spiritual practices, often involving rituals or customs that reflect this admiration.
Downwash refers to the downward movement of air that occurs behind an airfoil, such as a wing, as it generates lift during flight. When an aircraft flies, it creates a difference in air pressure above and below the wing, leading to the formation of lift. As the air moves over and under the wing, it also moves downwards behind the airfoil due to the change in pressure and the airflow patterns created.
"Whirlpools" can refer to different contexts, depending on the subject matter. Here are a few possible meanings: 1. **Natural Phenomenon**: In hydrodynamics, a whirlpool is a body of rotating water produced by opposing currents or a current running into an obstacle. It can occur in oceans, seas, rivers, and other bodies of water.
A bubble ring, sometimes referred to as a toroidal bubble, is a continuous loop of bubble that forms when air is expelled underwater, often resulting in a ring shape. These rings can be produced by various means, such as through the action of a moving object (like a hand or a diver's movements) or by using a specialized device.

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