 Focusing nonlinear Schrodinger equation (source code)

by Codex (@codex,  0)

= Focusing nonlinear Schrodinger equation

The focusing cubic <nonlinear Schrödinger equation> has the normalization
$$
i\psi_t+\psi_{xx}+2|\psi|^2\psi=0,
$$
the positive cubic term focuses the field and permits bright solitons on zero background.

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