Findings:

• The Matrix
• positronic matrix
• Matrix
• problem solving matrix
• Dot matrix printer
• Tone Matrix
• matrix computations
• Probability matrix
• Matrix of Leadership
• What is the Matrix?
• Magic Matrix
• matrix multiplication
• Strassen algorithm for matrix multiplication
• furby matrix
• symmetric matrix
• square matrix
• A real symmetric matrix has n eigenvalues
• The Matrix is going down for a reboot in 5 minutes: all users, please save your data and log out
• dot matrix
• MxN matrix
• Rank of a Matrix
• Reduced row echelon form
• nullity of a matrix
• upper triangular matrix
• transpose of a matrix
• augmented matrix
• coefficient matrix
• identity matrix
• mat-rix (user)
• metal matrix composite
• Jacobian Matrix
• adjoint matrix
• invertible matrix theorem
• matrix representation of Mobius functions
• Scary, xenophobic subtexts in The Matrix
• We are in The Matrix
• banded matrix
• The Dirty Matrix
• permutation matrix
• TI-89 Matrix
• matrix metering
• Coxeter matrix
• Hadamard matrix
• When discussing philosophy, please don't mention The Matrix
• Deus Ex Matrix (user)
• Passive Matrix LCD
• covariance matrix
• Is there one large Matrix or is there one for each crop?
• Steve Jobs Product Matrix
• rotation matrix
• Why can't they get out of The Matrix on cellular phones?
• orthogonal matrix
• diagonal matrix
• How did the matrix know what blue looked like?
• The Matrix Reloaded
• Monotonic matrix solution
• The Matrix a la VeggieTales
• Symphony #1 for Dot Matrix Printers
• Comparing The Matrix and Fahrenheit 451
• Black Matrix
• The Matrix Revisited
• extracellular matrix
• orthonormal matrix
• Reality Incompatibility Matrix
• How to find the inverse of a matrix
• Telepathic Matrix
• Toyota Matrix
• matrix color
• Boston Matrix
• matrix addition
• matrix multiplication by a scalar
• matrix subtraction
• Buck Rogers: Matrix Cubed
• Ansoff's matrix
• The standard matrix of a linear transformation
• stochastic matrix
• doubly stochastic matrix
• matrix learning
• Enter the Matrix
• defective matrix
• The Invisibles vs. The Matrix
• The Matrix Reloaded and nmap
• The Matrix Reloaded : The Album
• Secrets of The Matrix website
• CKM mixing matrix
• Sparse matrix
• Mars Matrix
• The Matrix Revolutions
• density matrix
• pocket matrix
• Hessian Matrix
• Pentile matrix
• The Matrix Online
• Bayer Matrix
• block matrix
• lower triangular matrix
• The Matrix: Path of Neo
• Harris matrix
• Matrix (user)
• Alfa Matrix
• matrix lives (user)
• Matrix function
• Delete Matrix?
• matrixx (user)
• liberate the nutrients from the cellular matrix
• strap yourself into the cornbread transformation matrix

If you Log in you could create a "lower-triangular matrix" node. If you don't already have an account, you can register here.