One day, a girl walks to her mother and look at her mother's hair and sadly said: "Why are some of your hair white mom?"
The mother replied, "Well, every time that you do something wrong and make me cry or unhappy, one of my hairs turns white.
The girl thought about this revelation a while, and then said, "Momma, how come *all* of grandma's hairs are white?"
Alfred TarskiBorn 14 Jan 1902; died 26 Oct 1983 at age 81. Polish-American mathematician and logician who made important studies of general algebra, measure theory, mathematical logic, set theory, and metamathematics. Formal scientific languages can be subjected to more thorough study by the semantic method that he developed. He worked on model theory, mathematical decision problems and with universal algebra. He produced axioms for “logical consequence,” worked on deductive systems, the algebra of logic and the theory of definability. Group theorists study “Tarski monsters,” infinite groups whose existence seems intuitively impossible. |
){kind=link}