Kathopanishat
kathopanishat: It is from krishna yajurveda shaakhaa. There are two adhyaayas in this which advocate advaita siddhaanta. Every adhyaaya has three sections called valli. Through nachiketopaakhyaanam vedaanta is explained. “nehanaanaasti kinchana” is main theory established here. The characteristics of eternal parabhrama are explained here, in the upanishat.