1. A reminder of Boolean algebra

Human thought is a symbiosis of logic and imagination, acting together or separately. Human logic is a sequence of ideas and concepts, concrete or abstract, leading to conclusions that may or may not lead to decisions. The forms of human thought, under the aspect of logic, are infinitely varied, as is the imagination. Many assume that this is a consequence of the asymmetry of the left and right half-brains, each with a different role but constantly communicating.

Ever since antiquity, ever since humans became, in anthropologists' terminology, homo-sapiens-sapiens, but especially since ancient Greek civilization, thinkers have sought to reconstruct the mechanisms of logic. From Aristotle to Chrysippus and many others, and much later George Boole, that brilliant English clergyman, and since then, here and there, in...