Fundamental Theorem of Genera
Consider 
proper equivalence classes of forms with discriminant 
equal to the field discriminant, then they can besubdivided equally into 
genera of 
forms which form a subgroup of the proper equivalence class groupunder composition (Cohn 1980, p. 224), where 
is the number of distinct prime divisors of . This theorem was proved byGauß 
in 1801.
References
Arno, S.; Robinson, M. L.; and Wheeler, F. S. ``Imaginary Quadratic Fields with Small Odd Class Number.'' http://www.math.uiuc.edu/Algebraic-Number-Theory/0009/. Cohn, H. Advanced Number Theory. New York: Dover, 1980. Gauss, C. F. Disquisitiones Arithmeticae. New Haven, CT: Yale University Press, 1966.
- Watson's Theorem
- Watt's Curve
- Watt's Parallelogram
- Wave
- Wave Equation
- Wavelet
- Wavelet Matrix
- Wavelet Transform
- Wave Operator
- Wave Surface
- Weak Convergence
- Weak Law of Large Numbers
- Weakly Binary Tree
- Weakly Complete Sequence
- Weakly Independent
- Weakly Triple-Free Set
- Weber Differential Equations
- Weber Functions
- Weber's Discontinuous Integrals
- Weber's Formula
- Weber-Sonine Formula
- Weber's Theorem
- Web Graph
- Wedderburn's Theorem
- Weddle's Rule