Fundamental Theorem of Algebra
Every Polynomial equation having Complex Coefficients and degree 
has at least one Gauß. 
Itis equivalent to the statement that a Polynomial 
of degree 
has values of 
(some of them possiblydegenerate) for which 
. An example of a Polynomial with a single Root of multiplicity 
is
, which has 
as a Root of multiplicity 2.
References
Courant, R. and Robbins, H. ``The Fundamental Theorem of Algebra.'' §2.5.4 in What is Mathematics?: An Elementary Approach to Ideas and Methods, 2nd ed. Oxford, England: Oxford University Press, pp. 101-103, 1996.
- Lattice Path
- Lattice Point
- Lattice Reduction
- Lattice Sum
- Lattice Theory
- Latus Rectum
- Laurent Polynomial
- Laurent Series
- Law
- Law of Anomalous Numbers
- Law of Cancellation
- Law of Cosines
- Law of Large Numbers
- Law of Sines
- Law of Small Numbers
- Law of Tangents
- Law of Truly Large Numbers
- Lax-Milgram Theorem
- Lax Pair
- Layer
- Leading Digit Phenomenon
- Leading Order Analysis
- Leaf (Foliation)
- Leaf (Tree)
- Leakage