The features of the paper are these: 1) we discuss {\bf especially} quadratic (alias bilinear) Bose-Hamiltonians, the related Bogoliubov transformations and {\bf especially} quasi-free-like (alias ...

This course prepares students for future Calculus coursework. Topics covered include: linear equations, slope of a line, quadratic equations, functions, transformations, inequalities, curve sketching, ...

Intended for students whose background in basic algebra is current. Topics covered include: linear equations, slope of a line, quadratic equations, functions, transformations, inequalities, curve ...

Gauge transformations constructed by means of the Jost solutions related to two similar cases of the quadratic bundle of general form are studied. Those transformations are taken at arbitrary fixed ...