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[fmadre at 2balles.cc]

The first discovery of formal logic in Ancient Greece - the so-called Sophists -were rather like traveling magicians or first-rate circus performers of our days. You paid your admission and watched the artist perform his tricks. He would, for instance, single out a man from the audience and address him as follows, 

                    You admit, sir, that you have that which you have not lost?

The innocent answer was, 

                    Of course.

Then, my friend,

                     the Sophist blandly continued, 

                                                               as you never lost a tail, you must have a tail.