References
[A:1] Daily scala: Enumeration J. Eichar 2009 http://daily-scala.blogspot.com/2009/08/enumerations.html
[A:2] Matrices and Linear Transformations 2nd edition C. Cullen, Dover Books on Mathematics 1990
[A:3] Linear Algebra: A Modern Introduction D. Poole, BROOKS/COLE CENGAGE Learning 2010
[A:4] Matrix decomposition for regression analysis D. Bates 2007 http://www.stat.wisc.edu/courses/st849-bates/lectures/Orthogonal.pdf
[A:5] Eigenvalues and Eigenvectors of Symmetric Matrices I. Mateev 2013 http://www.slideshare.net/vanchizzle/eigenvalues-and-eigenvectors-of-symmetric-matrices
[A:6] Linear Algebra Done Right 2nd edition §5 Eigenvalues and Eigenvectors S. Axler, Springer 2000
[A:7] First Order Predicate Logic S. Kaushik, CSE India Institute of Technology, Delhi http://www.cse.iitd.ac.in/~saroj/LFP/LFP_2013/L4.pdf
[A:8] Matrix Recipes J. Movellan 2005
[A:9] Gradient descent: Wikipedia, the free encyclopedia Wikimedia foundation http://en.wikipedia.org/wiki/Gradient_descent
[A:10...
