Campbell. The series deals with an advanced civilization that is able to travel between parallel universes with alternate histories, and uses that ability to ...
Paratime series
Short story series
The Paratime series written by H. Beam Piper and subsequently by John F. Carr consists of several short stories, one novella, and one novel, all but one of which were originally published in Astounding Science Fiction under the editorship of John... Wikipedia
Authors: H. Beam Piper, John F. Carr, and Roland J. Green
The ParaTime layer hosts many parallel runtimes (ParaTimes), each representing a replicated compute environment with shared state. Oasis architectural design ...