Journal of Mathematical PhysicsThermodynamics of a One-Dimensional System of Bosons with Repulsive Delta-Function InteractionChen Ning Yang, Changqing YangPublished Jul 1, 1969• 1,506 citationsPublisherAbstractThe equilibrium thermodynamics of a one-dimensional system of bosons with repulsive delta-function interaction is shown to be derivable from the solution of a simple integral equation. The excitation spectrum at any temperature T is also found.DOI10.1063/1.1664947