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uniform strength or to measure the magnetic Helmholtz equation a partial differential equation mathematically described by ∇ 2 + k 2 φ = 3Df , where ∇ 2 is the Laplacian, k is the wavenum- ber, f is the forcing function, and φ is the equation’s solution. HEMT See Henry, Joseph Henry is best known as the first Director (1846) of the Smithsonian hermetic seal a seal that is such that the object is gas-tight (usually a rate of less than × 10 −6 cc/s of helium). Hermite form of 2-D polynomial matrix denote by F m×n (z 1 ) [z 2 ] (F m×n [ z 1 ] [ z 2 ] ) the set of m × n polynomial matrices in z 2 with coefficients in the field F (z 1 ) (poly- nomial coefficients in z 1 ). 2-D polyno- mial matrix A(z 1 , z 2 ) ∈ F m×n [ z 1 , z 2 ] of full rank has Hermite form with respect to F m×n [ z 1 ] [ z 2 ] if A H (z 1 , z 2 ) = a 11 a 12 ... a 1 n 0 a 22 ... a 2 n ... ... ... ... 0 0 ... a nn 0 0 ... 0 ... ... ... ... 0 0 ... 0 if m > n a 11 a 12 ... a 1 n 0 a 22 ... a 2 n ... ... ... ... 0 0 ... a nn if m = n a 11 a 12 ... a 1 m ... a 1 n 0 a 22 ... a 2 m ... a 2 n ... ... ... ... ... ... 0 0 ... a mm ... a mn if m < n where deg z 2 a ii > deg z 2 a ki for k 6= i (deg z 2 denotes the degree with respect to z 2 ). In a similar way, the Hirmite form of A(z 1 , z 2 ) with respect to F [z 1 ] [ z 2 ] can be defined. A(z 1 , z 2 ) can be reduced to its Hermite form A H (z 1 , z 2 ) by the use of elementary row operations or equivalently by premultiplica- U(z 1 , z 2 ) (det U(z 1 , z 2 ) ∈ F (z 1 )), i.e., A H (z 1 , z 2 ) = U(z 1 , z 2 )A(z 1 , z 2 ). See for example, T. Kaczorek, Two-Dimensional Linear Systems, Hermite Gaussian beam electromag- netic beam solution of the paraxial wave Hermitian matrix a square matrix that equals its conjugate transpose. hertz a measure of frequency in which the number of hertz measures the number of Hertz dipole a straight, infinitesimally short and infinitesimally thin conducting fil- c 2000 by CRC Press LLC |