In calculus, the process of finding a function whose derivative is a given function. The term, sometimes used interchangeably with “antidifferentiation,” is indicated symbolically with the integral sign ∫. (The differential math.dmath.x usually follows to indicate math.x as the variable.) The basic rules of integration are: (1) ∫(math.f + math.g)math.dmath.x = ∫math.fmath.dmath.x + ∫math.gmath.dmath.x (where math.f and math.g are functions of the variable math.x), (2) ∫math.kmath.fmath.dmath.x = math.k∫math.fmath.dmath.x (math.k is a constant), and (3) (math.C is a constant). Note that any constant value may be added onto an indefinite integral without changing its derivative. Thus, the indefinite integral of 2math.x is math.x² + math.C, where math.C can be any real number. A definite integral is an indefinite integral evaluated over an interval. The result is not affected by the choice for the value of math.C. Seealso differentiation.

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International association of Latin American countries originally dedicated to improving its members' economic well-being through free trade. At its founding in 1960 LAFTA included Argentina, Brazil, Chile, Mexico, Paraguay, Peru, and Uruguay; by 1970 Ecuador, Colombia, Venezuela, and Bolivia had joined. The organization aimed to remove all trade barriers over 12 years, but its members' geographic and economic diversity made that goal impossible. LAFTA was superseded in 1980 by the LAIA, which established bilateral trading agreements between members, which were divided into three groups according to their level of economic development. Cuba was admitted with observer status in 1986, and it became a full member in 1999. Seealso Inter-American Development Bank.

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