Luminous: A collection of stories

Blurb

Luminous is a collection of short science fiction stories by Greg Egan.
Luminous contains the following short stories.
Chaff — An agent is sent to kill a geneticist who is working in a drug lord-controlled stronghold in the jungles of Colombia, and working on important brain-altering research.
Mitochondrial Eve — An organisation is trying to trace a common maternal ancestor for recent humanity.
Luminous — A pair of researchers find a defect in mathematics, where an assertion leads to a contradictory assertion after a long but finite series of steps. Using a powerful virtual computer made of light beams, they are able to map and shape the boundary between the near-side and far-side mathematics, leading to a showdown with real consequences in the physical universe.
Mister Volition
Cocoon
Transition Dreams
Silver Fire
Reasons To Be Cheerful — A boy discovers he has a serious brain tumour, which was causing him to be amazingly happy. With it removed, he becomes despondent, and undergoes a new and extensive treatment eventually, with a form of brain network, to try to get back to a more useful life many years later.