Finite verb to be omitted. For example, in the Latin sentence "cogito ergo sum" ("I think therefore I am") the finite verbs "cogito" and "sum" appear without an explicit subject – the subject is understood to be the first-person personal pronoun, and this information is marked by the way the verbs are inflected. In English, finite verbs lacking subjects are normal in imperative sentences: And also occur in some fragmentary utterances: The relatively poor system of inflectional morphology in English makes the central role that finite verbs play be often not so evident. In other languages, finite verbs are the locus of
Descartes number Descartes number In number theory, a Descartes number is an odd number which would have been an odd perfect number, if one of its composite factors were prime. They are named after René Descartes who observed that the number would be an odd perfect number if only were a prime number, since the sum-of-divisors function for would satisfy, if 22021 were prime, where we ignore the fact that reveals that 22021 is composite. A Descartes number is defined as an odd number where and are coprime and , whence is taken as a 'spoof' prime. The example given is the