Crinis
Encyclopedia
Crinis was a Stoic
STOIC
STOIC was a variant of Forth.It started out at the MIT and Harvard Biomedical Engineering Centre in Boston, and was written in the mid 1970s by Jonathan Sachs...

 philosopher. It is not certain when he lived, although a line in the Discourses
Discourses of Epictetus
The Discourses of Epictetus are a series of extracts of the teachings of the Stoic philosopher Epictetus written down by Arrian c. 108 AD. There were originally eight books, but only four now remain in their entirety, along with a few fragments of the others...

 of Epictetus
Epictetus
Epictetus was a Greek sage and Stoic philosopher. He was born a slave at Hierapolis, Phrygia , and lived in Rome until banishment when he went to Nicopolis in northwestern Greece where he lived the rest of his life. His teachings were noted down and published by his pupil Arrian in his Discourses...

 suggests that he lived at, or later than, the time of Archedemus
Archedemus of Tarsus
Archedemus of Tarsus, a Stoic philosopher who flourished c. 140 BC. Two of his works: On the Voice and On Elements , are mentioned by Diogenes Laërtius....

 (2nd century BC), and that he died from fright:
Go away now and read Archedemus; then if a mouse should leap down and make a noise, you are a dead man. For such a death awaits you as it did - what was the man's name? - Crinis; and he too was proud, because he understood Archedemus.


He was interested in Logic
Logic
In philosophy, Logic is the formal systematic study of the principles of valid inference and correct reasoning. Logic is used in most intellectual activities, but is studied primarily in the disciplines of philosophy, mathematics, semantics, and computer science...

, and wrote a book called Dialectic Art, , from which Diogenes Laërtius
Diogenes Laertius
Diogenes Laertius was a biographer of the Greek philosophers. Nothing is known about his life, but his surviving Lives and Opinions of Eminent Philosophers is one of the principal surviving sources for the history of Greek philosophy.-Life:Nothing is definitively known about his life...

 quotes:
An argument, as Crinis says, is that which is composed of a lemma
Lemma (logic)
In informal logic and argument mapping, a lemma is simultaneously a contention for premises below it and a premise for a contention above it....

 or major premise
Premise
Premise can refer to:* Premise, a claim that is a reason for, or an objection against, some other claim as part of an argument...

, an assumption or minor premise, and a conclusion; as for instance this,

"If it is day, it is light;"

"But it is day, therefore it is light."

For the lemma, or major premise, is, "If it is day, it is light."

The assumption, or minor premise, is, "It is day."

The conclusion follows, "Therefore it is light."
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