"An expert is a man who has made all the mistakes, which can be made, in a very narrow field."

                                    Niels Bohr

"A good stack of examples, as large as possible, is indispensable for a thorough understanding of any concept, and when I want to learn something new, I make it my first job to build one."

                                    Paul Halmos

"Information: the negative reciprocal value of probability."

                                   Claude Shannon