Editing Lambda (section)

===Upper-case letter Λ===
* Lambda can mean the [[empty set]] in [[mathematics]], though other symbols are more commonly used, such as <math>\varnothing</math>.
* The [[lambda particle]] is a type of [[subatomic particle]] in [[Physics#High energy/particle physics|subatomic particle physics]].
* Lambda is the set of logical axioms in the [[axiomatic method]] of logical deduction in [[first-order logic]].
* Lambda was used as a shield pattern by the [[Sparta]]n Army. This stood for [[Lakedaimon]], the name of the region of Sparta.
* Lambda is the [[von Mangoldt function]] in mathematical [[number theory]].
* In [[statistics]], [[Samuel Stanley Wilks|Wilks's lambda]] is used in multivariate analysis of variance ([[MANOVA]] analysis) to compare group means on a combination of dependent variables.
* In the [[Spectral decomposition#Normal matrices|spectral decomposition of matrices]], lambda indicates the [[diagonal matrix]] of the [[eigenvalues]] of the [[matrix (mathematics)]].
* In [[computer science]], lambda is the time window over which a process is observed for determining the working memory set for a [[digital computer]]'s  [[virtual memory]] management.
* In [[astrophysics]], lambda represents the likelihood that a small body will encounter a [[planet]] or a [[dwarf planet]] leading to a deflection of a significant magnitude. An object with a large value of lambda is expected to have [[clearing the neighbourhood|cleared its neighborhood]], satisfying the current [[definition of planet|definition of a planet]].
* In [[crystal optics]], lambda is used to represent the period of a lattice.
* In [[NATO]] military operations, a chevron (a capital lambda symbol) is painted on the vehicles of this military alliance for identification. (The [[Spartan army]] used a capital lambda on [[Spartan army#Clothing, arms and armor|its shields]].)
* In [[electrochemistry]], lambda denotes the "equivalent [[Electrical conductance|conductance]]" of an [[electrolyte]] solution.
* In [[cosmology]], lambda is the symbol for the [[cosmological constant]].
* In optics, lambda denotes the grating pitch of a [[Bragg reflector]].