A-ness, B-ness, C-ness

| Logic will here be defined as formal semiotic.  A definition of a sign will be given which no more
| refers to human thought than does the definition of a line as the place which a particle occupies, 
| part by part, during a lapse of time.  Namely, a sign is something, A, which brings something, B,
| its interpretant sign determined or created by it, into the same sort of correspondence with
| something, C, its object, as that in which itself stands to C.  It is from this definition,
| together with a definition of “formal”, that I deduce mathematically the principles of logic.
| I also make a historical review of all the definitions and conceptions of logic, and show,
| not merely that my definition is no novelty, but that my non-psychological conception of
| logic has virtually been quite generally held, though not generally recognized.
|
| C.S. Peirce, NEM 4, 20–21.

☞ http://intersci.ss.uci.edu/wiki/index.php/Sign_relation

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