In taxonomy, a trichotomy is speciation of three groups from a common ancestor, where it is unclear or unknown in what chronological order the three groups split.
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Category: Disambiguation Generally, a trichotomy is a splitting into three disjoint parts. ... In the fields of theology, and in philosophy, trichotomy is the belief that man consists of three parts; a body, soul, and spirit. ... Charles Darwins first sketch of an evolutionary tree from his First Notebook on Transmutation of Species (1837) Speciation is the theory of the evolutionary process by which new biological species are believed by some to arise. ... Image File history File links Disambig_gray. ...
In mathematics, the most concrete law of trichotomy that is usually seen is the statement that for any real numbers x and y, exactly one of the following relations holds:
More generally, a law of trichotomy is any statement that for some binary relation on some set S, which we may denote by using the "less than" symbol "<", and for any two members x, y ∈ S, exactly one of the relations above holds.
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