16 Boolean algebra, Tűring machines, and the Sheffer stroke function
What I put on paper is a record, a note, or a reminder. I think of it as external memory. External memory for me is any notational or schematic device that aids in recall--such as books, notes, sketches, maps, models, pictures, videotapes, and magnetic or digital memory stored in computer files. Since the beginning of the use of graphics and mathematics and with the development of alphabetical scripted languages, we have supplemented the internal memory of our brains with immense resources of external memory. We have done it on such a scale that at the present time we have no adequate conception of the extent of it. No encyclopedia can be any more than a superficial gloss on ...
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