ARITHMETIC GLOSSARY
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Title  Description  

Natural  The set of Natural Numbers is also the set of counting numbers, the same numbers we learn to count when we're little kids: 1, 2, 3, 4.... Precisely in the language of math these are the positive integers. 

Natural Numbers  The set of Natural Numbers is also the set of counting numbers, the same numbers we learn to count when we're little kids: 1, 2, 3, 4.... More precisely in the language of math these are the positive integers. 

Negative  Real values less than zero are Negative. We also consider the Negative of a real value to have the opposite sign, as the opposite (or Negative) of a Negative value is positive. 

Negative Reciprocal  The product of two Negative Reciprocals is 1. When lines in Cartesian or rectangular coordinates meet at right angles they have Negative Reciprocal slopes, unless they are precisely horizontal and vertical. 

Nonnegative  We have occasions to refer to all positive values as well as to zero. These are all the real values that are Nonnegative. Literally, not negative. 

Nonzero  Literally, not zero. Typically used to mean either positive or negative values. 

Nth Degree  Simply raised to the degree of integer (usually) n, or N. In common, everyday language, to pursue something excessively, as parents giving the suitor of their teenage daughter an interrogation "to the nth degree." 

Nth Root  Given some integer N and a real value, the Nth Root of the real value is the number that when raised to the N power returns the real value. 

Null Set  The Null Set is the empty set. Mathematically there is but one empty set, the unique Null Set, the set with nothing in it. 

Number Line  The real Number Line is a depiction of the set of all real numbers from negative infinity to positive infinity. All real numbers lie on the Real Number Line. 

Numerator  The top number in a fraction, above the fraction bar, is the Numerator. It is the dividend to be divided by the divisor, which is the denominator. 
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