Diagonalização, Paradoxos e o Teorema de Löb

Diagonalization is a transversal theme in Logic. In this work, it is shown that there exists a common origin of several diagonalization phenomena — paradoxes (the Liar, Curry's Paradox, and Russell's Paradox) and Löb's Theorem. That common origin comprises a common reasoning and a common logical structure. We analyse the common structure from a philosophical point-of-view and we draw some conclusions.