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math-ph2002★ 3 cited
On the q-analogues of the Zassenhaus formula for dientangling exponential operators
R. Sridhar, R. Jagannathan
Katriel, Rasetti and Solomon introduced a -analogue of the Zassenhaus formula written as , where and …
physics.optics2002★ 19 cited
Foldy-Wouthuysen transformation and a quasiparaxial approximation scheme for the scalar wave theory of light beams
Sameen Ahmed Khan, Ramaswamy Jagannathan, Rajiah Simon
The Foldy-Wouthuysen iterative diagonalization technique is applied to the Helmholtz equation to obtain a Hamiltonian description of the propagation of a monochromatic quasiparaxia…