Orthogonal (series)

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Orthogonal is a science fiction trilogy by Australian author Greg Egan taking place in a universe where, rather than three dimensions of space and one of time, there are four fundamentally identical dimensions.[1]

Technically, the space-time of the universe portrayed in the novels has a positive-definite Riemannian metric, rather than a pseudo-Riemannian metric, which is the kind that describes our own universe.

The first novel of the trilogy, The Clockwork Rocket, was published in 2011,[2] the second, The Eternal Flame, in 2012,[3] and the third, The Arrows of Time, in 2013.[4]


  1. ^ Greg Egan. "Plus, Minus: A Gentle Introduction to the Physics of Orthogonal". Retrieved 17 May 2012. 
  2. ^ Night Shade Books web site. "The Clockwork Rocket". Retrieved 17 May 2012. 
  3. ^ Night Shade Books web site. "The Eternal Flame". Retrieved 7 Sep 2012. 
  4. ^ Orion Publishing Group web site. "The Arrows of Time". Retrieved 22 Nov 2013. 

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