Cynodonta contains the most mammal-like of the non-mammaliantherapsids, which are sometimes termed 'mammal-like reptiles'. The most derived cynodonts are found within a taxon called Eucynodontia, which also contains the members of Mammalia.
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... formula should be understood as "either of those element(s) of the field whose square equals b2 - 4ac". In some fields, some elements have no square roots and some have ...