Category: Disambiguation The first few hydrogen atom electron orbitals shown as cross-sections with color-coded probability density. ... Acyclic can mean any of the following: In chemistry, an acyclic compound is a hydrocarbon compound having an open chain. ... In an undirected graph, a connected component or component is a maximal connected subgraph. ... In this Feynman diagram, an electron and positron annihilate and become a quark-antiquark pair. ... A labeled tree with 6 vertices and 5 edges In graph theory, a tree is a graph in which any two vertices are connected by exactly one path. ... A labeled graph with 6 vertices and 7 edges. ... Classical physics is physics based on principles developed before the rise of quantum theory, usually including the special theory of relativity and general theory of relativity. ... Fig. ... In calculus, the integral of a function is a generalization of area, mass, volume and total. ... A physical quantity is either a quantity within physics that can be measured (e. ... In physics, a one-loop Feynman diagram is a connected Feynman diagram with only one cycle (unicyclic). ... Linguistics is the scientific study of human language, and someone who engages in this study is called a linguist. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... A syllable (Ancient Greek: ) is a unit of organization for a sequence of speech sounds. ... Phonology (Greek phone = voice/sound and logos = word/speech) is a subfield of grammar (see also linguistics). ... A graph of a bell curve in a normal distribution showing statistics used in educational assessment, comparing various grading methods. ... A schematic of the Washington Metro. ... Image File history File links Disambig_gray. ...