Rotating Cylinders and the Possibility of Global Causality Violation (#102)

1977-08Time Travel/Parallel Universe Short StoryAnalog, August 1977

Microcosmic Tales, ed. Isaac Asimov, Martin H. Greenberg & Joseph D. Olander, Taplinger 1980;
Japanese, Isaac Asimov's Science Fiction Magazine, 1981, along with an extensive interview with photos;
Anthology, Time Machines: The Best Time Travel Stories Ever Written, ed. Bill Adler, Jr., Carroll & Graf, December 1997, hardbound;
Convergent Series
Title stolen from a mathematics paper by Frank J. Tipler

First published in Analog, August 1977. Niven borrowed the title of a mathematics paper by Frank J. Tipler for this look at the principle of "cosmic censorship," the way the universe protects itself (sometimes rather violently) from the paradoxes implied by time travel.