In the context of Wikipedia, "Seismology stubs" refers to short articles or entries related to seismology that contain limited information and are in need of expansion. A "stub" is a classification that indicates that an article is incomplete and could be greatly improved with additional content, references, or details. Seismology is the scientific study of earthquakes and the propagation of elastic waves through the Earth or other planet-like bodies.
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.