Attic numerals, also known as Attic numeration or Athenian numerals, were a system of numerical notation used in ancient Athens. This system was distinct from the more widely known Greek numeral system that used alphabetic characters to represent numbers. Instead, Attic numerals utilized a combination of specific symbols and a base-10 counting method.
Ancient Greek mathematicians were scholars from ancient Greece who made significant contributions to mathematics, laying the foundation for various fields such as geometry, arithmetic, number theory, and mathematical logic. They were known for their systematic approaches to mathematical problems, theorems, and proofs. Here are some of the most notable Ancient Greek mathematicians: 1. **Pythagoras (c.
George Woltman is a mathematician known primarily for his contributions to the field of computer science, particularly in the area of software development for the discovery of large prime numbers. He is recognized for creating the program known as "Prime95," which is used for primality testing and is part of the GIMPS (Great Internet Mersenne Prime Search) project.
A Pulsar Timing Array (PTA) is a scientific method used to detect and study gravitational waves through the precise monitoring of millisecond pulsars. Millisecond pulsars are highly stable rotating neutron stars that emit beams of radio waves, which can be observed from Earth. The timing of the arrival of these radio pulses can be measured with extreme precision, often to within nanoseconds.
A matched filter is a signal processing technique used to maximize the signal-to-noise ratio (SNR) when detecting a known signal in the presence of noise. It is particularly useful in situations where the signal is embedded in a noisy environment, such as in radar, communications, and image processing. ### Key Concepts 1. **Purpose**: The primary purpose of a matched filter is to identify the presence of a specific signal shape (or template) within a received noisy signal.
Livingston is a small town located in Livingston Parish, Louisiana, in the United States. It serves as the parish seat and is part of the Baton Rouge metropolitan area. The town is known for its rural charm, historical sites, and proximity to various natural attractions, including lakes and parks. Livingston has a population that generally reflects a small, close-knit community.
The LIGO Scientific Collaboration (LSC) is a group of scientists who work together to operate and analyze data from the Laser Interferometer Gravitational-Wave Observatory (LIGO), which is designed to detect gravitational waves—ripples in spacetime caused by some of the most violent and energetic processes in the universe, such as merging black holes and neutron stars.
"LIGO" is a 2022 Indian Malayalam-language film directed by Balaji. The film is a comedy-drama that revolves around the life of a man who becomes embroiled in a series of events related to the installation of a gravitational wave detector, inspired by the real-life LIGO (Laser Interferometer Gravitational-Wave Observatory) project. The narrative explores themes of science, community, and personal growth, blending humor with thought-provoking ideas.
Gravitational wave background refers to a stochastic (random) background of gravitational waves generated by many independent astrophysical sources, rather than the direct signal from a single event, such as the collision of two compact objects (like neutron stars or black holes) which are typically studied in gravitational wave astronomy.
A gravitational-wave observatory is a scientific facility designed to detect and measure gravitational waves, which are ripples in spacetime caused by the acceleration of massive objects, such as merging black holes or neutron stars. These waves were first predicted by Albert Einstein in 1916 as part of his general theory of relativity, but they weren't observed directly until 2015. Gravitational-wave observatories typically use highly sensitive instruments to measure incredibly small changes in distance caused by passing gravitational waves.
The first observation of gravitational waves was made on September 14, 2015, by the Laser Interferometer Gravitational-Wave Observatory (LIGO). This groundbreaking event was the result of the merger of two black holes approximately 1.3 billion light-years away from Earth. The detected gravitational waves were a confirmation of a key prediction of Albert Einstein's general theory of relativity, which was proposed over a century earlier.
Chirp mass is a concept used in astrophysics, particularly in the study of binary systems of compact objects like black holes or neutron stars. It is a parameter that combines the masses of the two objects in the binary system into a single value that characterizes the gravitational waves emitted as the two objects spiral towards one another and eventually merge.
The Binary Black Hole Grand Challenge Alliance (BBHGCA) is an initiative aimed at advancing the understanding and simulation of binary black hole systems, particularly in the context of gravitational wave research. This collaborative alliance typically consists of physicists, astrophysicists, and computational scientists who work together to create detailed models and simulations of binary black hole mergers.
The Advanced LIGO Documentary Project is a documentary initiative focused on the Laser Interferometer Gravitational-Wave Observatory (LIGO) and its groundbreaking work in the field of gravitational wave detection. LIGO is a large-scale physics experiment designed to detect and measure gravitational waves—ripples in spacetime caused by some of the most violent and energetic processes in the universe, such as the collision of black holes or neutron stars.
ACIGA stands for the Australian Capital Territory Insurance and Gaming Authority. It is a regulatory body responsible for overseeing the insurance and gaming sectors in the Australian Capital Territory (ACT). ACIGA's primary objectives include ensuring compliance with relevant laws and regulations, protecting consumers, and promoting fair and responsible practices within these industries. The authority plays a crucial role in licensing, monitoring, and enforcing standards to maintain the integrity of insurance and gaming activities in the region.
Gravitational waves are ripples in the fabric of spacetime that are produced by some of the most violent and energetic processes in the universe. They were first predicted by Albert Einstein in 1916 as a consequence of his General Theory of Relativity. According to this theory, massive objects, such as black holes or neutron stars, can warp spacetime, and when they accelerate, for example, in binary systems, they create these waves that propagate at the speed of light.
Gravitational wave observatories are scientific facilities designed to detect and analyze gravitational waves—ripples in spacetime caused by accelerating massive objects, such as merging black holes or neutron stars. These observatories use highly sensitive technology to measure minute changes in distance, which occur when gravitational waves pass through the Earth.

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 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