symplectic matrix – English noun declension

Noun: symplectic matrix

Singular	symplectic matrix
Plural	symplectic matrices

Then we define the Krein signature of the eigenvalues of modulus one of a symplectic matrix and use this concept to build the rotation function on the symplectic group. [2001, Alberto Abbondandolo, Morse Theory for Hamiltonian Systems, CRC Press (Chapman & Hall/CRC), page x:]
In the previous chapter algorithms for computing the eigenvalues of symplectic matrices have been considered that are based on an elimination process for computing the butterfly form of symplectic matrix. Unfortunately, this approach is not suitable when dealing with large and sparse symplectic matrices as an elimination process can not make full use of the sparsity. [2002, Heike Fassbender, Symplectic Methods for the Symplectic Eigenproblem, Kluwer Academic, page 173:]
In order to fully exploit these structures we rely on the properties of Hamiltonian, skew-Hamiltonian, and symplectic matrices discussed in Section 1.5. In Section 4.1 we introduce the elementary symplectic matrices which are used by the structured algorithms. [2012, Dario A. Bini, Bruno Iannazzo, Beatrice Meini, Numerical Solution of Algebraic Riccati Equations, Society for Industrial and Applied Mathematics, page 121:]

English noun forms of symplectic matrix