Typographical Number Theory is a notation created in 1979 by Douglas Hofstadter.
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Typographical Number Theory (TNT) is a formal axiomatic system describing the natural numbers that appears in Douglas Hofstadter's book G枚del, Escher, Bach. It is an implementation of Peano arithmetic that Hofstadter uses to help explain G枚del's incompleteness theorems. Like any system implementing the Peano axioms, TNT is capable of referring to itself (it is self-referential).. Read more on Wikipedia...