Fish are cold-blooded. Humans are not fish. Humans are warm-blooded. Humans are warm-blooded. Fishermen are human.
Fishermen are warm-blooded.
Some example deductive arguments. Little is known of his life other than that he taught mathematics in Alexandria. Rather than representing Euclid's original work, the Elements are now thought to be a summary of the geometrical knowledge current during his time. However, they represent one of the earliest uses of proof in the history of mathematics. He then presents a set of ten assumptions .