i
The Imaginary Number 
is defined as 
. However, for some reason engineers and physicistsprefer the symbol j to . Numbers of the form 
where 
and 
are Real Numbers are called Complex Numbers, and when 
is used to denote a Complex Number, it issometimes (in older texts) called an ``Affix.''
The Square Root of is
 | (1) |
 | (2) |
, | (3) |
 | (4) |
The Principal Value of 
is
 | (5) |
References
Courant, R. and Robbins, H. What is Mathematics?: An Elementary Approach to Ideas and Methods, 2nd ed. Oxford, England: Oxford University Press, p. 89, 1996.
- Near-Integer
- Near Noble Number
- Near-Pencil
- Necessary
- Necker Cube
- Necklace
- Needle
- Negation
- Negative
- Negative Binomial Distribution
- Negative Binomial Series
- Negative Integer
- Negative Likelihood Ratio
- Negative Pedal Curve
- Neighborhood
- Neile's Parabola
- Nephroid
- Nephroid Evolute
- Nephroid Involute
- Nerve
- Nested Hypothesis
- Nested Radical
- Net
- Net (Polyhedron)
- Netto's Conjecture