The British Origami Society (BOS) is an organization dedicated to promoting the art and craft of origami, the Japanese art of paper folding, in the United Kingdom. Established in 1967, the society aims to foster interest in origami, encourage creativity, and provide resources for both beginners and experienced folders. The society often organizes events, workshops, and conventions, and it publishes a magazine that features articles, designs, and tutorials related to origami.
Feynman diagrams are graphical representations of the interactions between particles in quantum field theory. They are used to visualize and calculate the probabilities of various physical processes, including particle collisions and decays. A list of Feynman diagrams typically includes diagrams associated with specific types of interactions in quantum field theories. These diagrams represent fundamental interactions such as: 1. **Quantum Electrodynamics (QED)**: - Electron-positron annihilation into photons.
Algebraic logic is a branch of mathematical logic that studies logical systems using algebraic techniques and structures. It provides a framework where logical expressions and their relationships can be represented and manipulated algebraically. This area of logic encompasses various subfields, including: 1. **Algebraic Semantics**: This involves modeling logical systems using algebraic structures, such as lattices, Boolean algebras, and other algebraic systems.
A quadratic residue is a concept from number theory, particularly in the study of modular arithmetic.
Algebraic topology is a branch of mathematics that studies topological spaces with the help of algebraic methods. The fundamental idea is to associate algebraic structures, such as groups or rings, to topological spaces in order to gain insights into their properties. Key concepts in algebraic topology include: 1. **Homotopy**: This concept deals with the notion of spaces being "continuously deformable" into one another.
Category theory is a branch of mathematics that focuses on the abstract study of mathematical structures and relationships between them. It provides a unifying framework to understand various mathematical concepts across different fields by focusing on the relationships (morphisms) between objects rather than the objects themselves. Here are some key concepts in category theory: 1. **Categories**: A category consists of objects and morphisms (arrows) that map between these objects. Each morphism has a source object and a target object.