Mathematics for Business and Economics GEN1201/ECN1201 L, Kalybay Aigerim

Identity is an equality that remains true regardless of the values of any variables that appear within it. 

Infinity is a quantity or set of numbers without bound, limit or end, whether countably infinite like the set of integers, or uncountably infinite like the set of real numbers (represented by the symbol ∞). 

Integers are whole numbers, both positive (natural numbers) and negative, including zero. 

Integral is the area bounded by a graph or curve of a function and the x axis, between two given values of x (definite integral), found by the operation of integration. 

Integration is the operation in calculus (inverse to the operation of differentiation) of finding the integral of a function or equation. 

Irrational numbers are numbers that can not be represented as decimals (because they would contain an infinite number of non-repeating digits) or as fractions of one integer over another, e.g. Π, √2, e.