Glossary



** Additive inverse of a number: ** is the opposite of that number, ie the additive inverse of a number x is - x. The sum of a number and its additive inverse is always zero. ** Combinatory: ** is the part of mathematics that aims at studying problems of number of elements. That is, is responsible for determining the number of elements of a finite set that meet certain conditions. ** Coplanar vectors: ** two vectors (or 2 points) are coplanar when they belong to the same plane (respectively, related to the same plane). **
 * Binomial: ** is an algebraic expression with two terms, ie, a polynomial with two terms.
 * Cartesian coordinates: ** is a reference system about an axis, two axes (plane) or three axes (space) perpendiculars to each other, which intersect at a point called origin of coordinates.

Cyclic Group: ** A group is cyclic when monogene (generated by a single element) and also finite.  ** Disjoint sets: ** two sets are disjoint if their intersection is empty. Otherwise we will say that they are cut.   ** Fibonacci sequence: ** is the sequence of numbers: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ... Each number is calculated by adding the two before him. ** Infimum: ** I is the infimum of the set A if it is the largest of the lower bounds of the set A. We write I = inf A.  ** Quotient: ** is the result of a division.   ** Subset: ** is a set that is part of another given set. A set A is a subset of a set B if every element of A is an element of B. Every set is a subset of itself. ** Supremum of a set: ** it is the lesser of the upper bounds of a set bounded above.
 * Cube: ** is a solid figure or regular polyhedron that is bounded by six equal squares.
 * Equation: ** is an equality that has one or more unknowns, which are related by arithmetic.
 * Fraction: ** is the expression of a quantity divided by another.
 * Function: ** Is a correspondence of a set X of real numbers and a set of real numbers.
 * Parallel lines: ** Two lines are parallel, if in the same plane and not intersect.
 * Serie: ** is the sum of the terms of a sequence.
 * Vector: ** It is a directed line segment in space. All the vectors have: magnitude, direction and sense.


 * Volume: ** is the amount of three-dimensional space that an object occupies.