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