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Signature matrices are matrices with specific structure and spectrum, and define ETFs up to unitary equivalence.
Random matrices are matrices whose entries are random numbers, subject to suitable probability distributions, such as matrix normal distribution.
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A group in which the objects are matrices and the group operation is matrix multiplication is called a matrix group.
One special but common case is block matrices, which may be considered as matrices whose entries themselves are matrices.
The major enzymes responsible for matrix degradation are matrix metalloproteases (MMPs).
where is an observable random matrix,,, and are known matrices, respectively., are unknown matrices.
Their collocation matrices are called Lupaş matrices.
These matrices are sparse matrices.
Usually the noise matrices are diagonal matrices.
These two matrices are nonVandermonde matrices and invertible.
For example, the well-known Hadamard matrices are jacket matrices.
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