Using Fuzzy concepts (the intellectual origins of which as a logical category can be traced back to Plato, an Athenian philosopher, amongst others) to define sandwiches, a peanut butter and jelly sandwich has an unweighted score of 7 and is categorized as a sandwich, while a hamburger without bun has an unweighted score of 1, and is not categorized as a sandwich.
The intellectual origins of the species of fuzzy concepts as a logical category have been traced back to a diversity of famous and less well-known thinkers, including (among many others) Eubulides, Plato, Cicero, Georg Wilhelm Friedrich Hegel, Karl Marx and Friedrich Engels, Friedrich Nietzsche, Hugh MacColl, Charles S. Peirce, Max Black, Jan ukasiewicz, Emil Leon Post, Alfred Tarski, Georg Cantor, Nicolai A. Vasiliev, Kurt Godel, Stanisaw Jaskowski and Donald Knuth. Plato (/pleto/ PLAY-toe; Greek: Platon, pronounced [pla.tn in Classical Attic; 428/427 or 424/423  348/347 BC) was an Athenian philosopher during the Classical period in Ancient Greece, founder of the Platonist school of thought, and the Academy, the first institution of higher learning in the Western world. Peanut butter and jelly sandwich 7 Sandwich Hamburger without bun 1 Burger (patty) with toppings 
