Graham Higman was a prominent British mathematician known for his contributions to group theory and the theory of algebraic structures. Born on July 6, 1916, and passing away on May 11, 2008, Higman made significant advancements in several areas of mathematics. One of his notable works includes the Higman embedding theorem, which relates to the process of embedding finitely generated groups into finitely presented groups.
Birger Møller-Pedersen is a Danish computer scientist known for his contributions to programming languages, particularly in the area of logic programming and the development of the programming language BETA. He has been actively involved in research related to functional programming, object-oriented programming, and programming language design.
CECPQ1 stands for "Commendable Encryption for Classical Public Key Quantum-resistant" and is a key exchange mechanism designed to be secure against potential future attacks by quantum computers. Specifically, CECPQ1 is developed to be used in scenarios where both classical and quantum-resistant security are required.
In mathematics, the term "envelope" can refer to a variety of concepts depending on the context in which it is used. Here are a few common interpretations: 1. **Envelope of a Family of Curves**: The envelope of a family of curves is a curve that is tangent to each member of the family at some point.
The term "Saturn-crossing minor planets" refers to a subset of minor planets (asteroids and other small bodies) that have orbits that cross the orbit of Saturn. These objects can belong to different groups, including asteroids from the main asteroid belt as well as centaurs and trans-Neptunian objects. The significance of these objects lies in their potential to cross the orbits of outer planets, which can affect their trajectories due to gravitational interactions.
"Language, Truth, and Logic" is a philosophical work written by A.J. Ayer, first published in 1936. The book is a foundational text in the field of logical positivism, a philosophical movement that emerged in the early 20th century, emphasizing the verification principle—the idea that a statement is only meaningful if it can be empirically verified or is analytically true.
The Vienna Circle was a group of philosophers and scientists active in Vienna, Austria, during the early 20th century, particularly in the 1920s and 1930s. The group is best known for its role in the development of logical positivism, a philosophical movement that emphasized the importance of empirical verification and scientific methodology.
The first stellation of the rhombic dodecahedron refers to a process of creating a new polyhedron by extending the faces of the original rhombic dodecahedron until they meet. The rhombic dodecahedron is a convex polyhedron with 12 rhombic faces, which is the dual of the cuboctahedron.
An euthanasia device is a tool or contraption designed to assist in administering euthanasia, which is the act of intentionally ending a person's life to relieve them of suffering, often in cases of terminal illness or severe pain. Such devices are intended to provide a humane and painless method for individuals who have chosen to end their life, usually in jurisdictions where euthanasia or assisted suicide is legally permitted.
An electric machine is a device that converts electrical energy into mechanical energy, or vice versa, or sometimes both. These machines can be broadly classified into two categories: electric motors and electric generators. 1. **Electric Motors**: These devices convert electrical energy into mechanical energy. They operate on the principle of electromagnetism, where electric current flowing through coils produces magnetic fields that interact with permanent magnets or other magnetic fields to produce motion.
"Machine sex" typically refers to the interaction between humans and machines in a sexual context. This can encompass various forms of sexual activities involving technology, such as: 1. **Sex Robots**: These are robotic devices designed to simulate human sexual partners. They can range from basic models to highly advanced robots with realistic features and interactive capabilities.
The Gunderson Do-All machine, also known as a Gunderson Do-All, is a type of specialized railway maintenance equipment primarily used in the railroad industry. It is designed for the efficient handling, maintenance, and repair of railroad tracks and ties. This machine typically features several functionalities, including rail inspection, rail cutting, rail grinding, and the ability to transport and install ties, which contributes to the overall upkeep of railway infrastructure.
A Self-Propelled Modular Transporter (SPMT) is a type of heavy-duty transport vehicle used for moving oversized loads and heavy equipment. These vehicles are specifically designed to transport large and heavy objects, such as industrial machinery, bridges, and entire buildings, often over short distances, such as from a manufacturing facility to a construction site.
Ceramic engineering is a branch of engineering that focuses on the design, development, and production of ceramic materials, which are inorganic, non-metallic materials that are typically made from oxides, carbides, nitrides, and other compounds. These materials can exhibit a wide range of properties, including high strength, hardness, thermal stability, electrical and thermal insulation, and resistance to chemical corrosion.
Cyclic stress refers to the repeated application of stress on a material over time, which can lead to fatigue and eventual failure. It is typically characterized by cycles of loading and unloading, where the stress varies between a minimum and a maximum value. Cyclic stress is important in materials and structural engineering because many components are subject to fluctuating forces during their service life, such as those in rotating machinery, bridges, and aircraft.
"Engineered cellular magmatic" isn't a widely recognized term in geology or materials science as of my last knowledge update in October 2021. It's possible that the term refers to a new or specialized field of study or a specific research project involving the engineering or manipulation of cellular structures (such as in biological or synthetic contexts) in conjunction with magmatic processes (relating to magma or molten rock).
A **pole figure** is a graphical representation used in materials science and crystallography to describe the preferred orientation of crystallites in a polycrystalline material. It provides a way of visualizing the anisotropy of the material by displaying how the orientations of crystallites are distributed in three-dimensional space, usually projected onto a two-dimensional plane. ### Key Concepts: 1. **Crystallographic Orientation**: In a polycrystalline material, individual grains can have different crystallographic orientations.
Schmid's Law, named after the German engineer Erich Schmid, is a fundamental principle in the field of materials science and solid mechanics that describes the relationship between the applied stress and the resulting slip in crystalline materials during plastic deformation. It is particularly relevant to the study of single crystal materials. According to Schmid's Law, the critical shear stress required to initiate slip (plastic deformation) in a crystal is directly related to the applied normal stress.
Thermomechanical analysis (TMA) is a technique used to study the mechanical properties of materials as they change with temperature. It involves applying a controlled temperature program to a sample while simultaneously measuring its mechanical response, such as dimensional changes, stiffness, or viscoelastic properties. This analysis helps in understanding how materials behave under thermal conditions, which is particularly important for polymers, metals, ceramics, and composites.

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