Noetics
The early period of the Seventh Mental Structure is also called the Time of the Second Immortality, for the defects of the Compositional mental noosophic recording systems were cured. Noumenal mathematics allowed for the modeling of essential and ineffable human memory characteristics, to such a level of fine detail that individual human minds could be recorded, duplicated, and reproduced; and differences between the original template and the copy were below detectable limits, both mechanical detection thresholds and the intuitive and emotional threshold that allowed the revenants' copies to be regarded as being one and the same as the originals by friends, family, and society. While philosophers and Sophotechs might recognize that the dead, despite all appearances, truly were dead, for all practical and legal purposes, any mind that had sufficient continuity of memory with his original template was considered to be that selfsame person.