second species

second species

[¦sek·ənd ′spē‚shēz]
(mathematics)
The class of sets G0 such that all the sets Gn are nonempty, where, in general, Gn is the derived set of Gn-1.
References in classic literature ?
It appears to me a curious circumstance, as showing the fine shades of difference in habits, that judging from this latter respect alone, when I first saw this second species, I thought it was different from the Maldonado kind.
com)-- July's releases from Class Act Books feature another entry in the Dark Urban Fantasy series The Second Species as well as Science Fiction and Horror.
Shadow Law, Book 5 in the Second Species series, continues the story of the Strigoi clan's pursuit of Mircea Ravagiu, murderer of their family and the reason they were exiled from their Carpathian home.
A 1995 fish kill in eastern North Carolina led to the discovery by North Carolina State University marine scientists of a second species of Pfiesteria.
He welcomes the data on a second species but cautions that pesticide susceptibility arises in complex patterns.
A resilient variety of golden trout, California's state fish, may become only the second species to fight its way back from the brink of extinction and off the federal endangered species list.
A second species better at scavenging that nutrient then comes into its own and supplants the first.
With the recent genetic evidence, New Zealand officials have recognized a second species, the olive yellow Sphenodon guntheri, as distinct from the more abundant but drabber S.