subtraction formulas
61Julian day — JDN redirects here. For the military IT system, see Joint Data Network. For the comic book character Julian Gregory Day, see Calendar Man. Not to be confused with Julian year (disambiguation). Julian day is used in the Julian date (JD) system of… …
62Magnetic circular dichroism — (MCD) is the differential absorption of left and right circularly polarized (LCP and RCP) light, induced in a sample by a strong magnetic field oriented parallel to the direction of light propagation. MCD measurements can detect transitions which …
63List of relativistic equations — A list of relativistic equations: List of Equations Lorentz Transformation:eta = frac{v}{c}: gamma = frac{1}{sqrt{1 eta^2The Lorentz transformation::x = gamma left ( x v t ight ):y = y ,:z = z ,:t = gamma left ( t frac{v x}{c^2} ight )Time… …
64Four fours — is a mathematical puzzle. The goal of four fours is to find the simplest mathematical expression for every whole number from 0 to some maximum, using only common mathematical symbols and the digit four (no other digit is allowed). Most versions… …
65Affine geometry — is a form of geometry featuring the unique parallel line property (see the parallel postulate) but where the notion of angle is undefined and lengths cannot be compared in different directions (that is, Euclid s third and fourth postulates are… …
66Multiset — This article is about the mathematical concept. For the computer science data structure, see Set (computer science)#Multiset. In mathematics, the notion of multiset (or bag) is a generalization of the notion of set in which members are allowed to …
67Bowl Championship Series — The Bowl Championship Series (BCS) is a selection system designed to give the top two teams in the NCAA FBS Bowl Subdivision System an opportunity to compete in a national championship game . This championship is intended as a surrogate for a… …
68Exsecant — The exsecant, also abbreviated exsec, is a trigonometric function defined in terms of the secant function sec( theta;)::operatorname{exsec}( heta) = sec( heta) 1 ,.Once important in fields such as surveying, astronomy, and spherical trigonometry …
69Communication with Extraterrestrial Intelligence — CETI (Communication with Extraterrestrial Intelligence) is a branch of SETI research that focuses on composing and deciphering messages that could theoretically be understood by another technological civilization. The best known CETI experiment… …
70Principles and Standards for School Mathematics — are guidelines produced by the National Council of Teachers of Mathematics (NCTM) in 2000, setting forth recommendations for mathematics educators.[1] They form a national vision for preschool through twelfth grade mathematics education in the US …
