## Symbols and Notation -the set of positive integers and zero –x is greater than y is greater than –x is less than y

x &gt;=y – x is greater than or equal to y -the set of integers,  -the set of positive integers,  -the set of rational numbers -the set of positive rational numbers -the nth term of a sequence or series -a function under which x is mapped to y theimage of x under the function f –the inverse of the function f theset of real numbers -the set of real positive numbers -logarithm to the base a of x

sin, cos, tan - the circular/trigonometric functions theset with elements  -the point A in the plane with Cartesian coordinates x and y -the number of elements in the finite set A -the set of all x such that the statement is true  –x is a member of the set A –x is a member of the set A or –the empty or null set, containing no elements –the union of sets A and B – the set of elements in either A or B –the intersection of sets A and B – the set of elements in both Aand B -the universal set -A is a proper subset of B -A is a subset of B, and A may be equal to B –the complement of the set A – the set of all elements not in set A. –the Angle at A -the angle between CA and AB -the triangle whose vertices are A, B and C - the vector  –the length or magnitude of the vector  –the vector from point A to point B –the distance between points A and B -observations of a variable -the frequencies with which the observations occur -probability of event A -probability of the event “not A” –the mean of the values x_1 , x_2 , … –Pearson's correlation coefficient –coefficient of determination –sum of the frequencies  –the nth root of a . If n &gt;0 is even, then a must be positive –the absolute value or magnitude of x –denotes identity or equivalency -x is approximately equal to y -A is congruent to B -vectors and areparallel -vectors and areperpendicular 