by Paul Lorenzen , J. B. Grize
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Formale Logik
Einführung in die operative Logik und Ma...
Métamathématique
Lógica Formal
Formal logic
Watershed assessment and TMDL final repo...
Gödel's proof
Gödel, Escher, Bach
Metamagical Themas
How to Bake Pi
Introduction to metamathematics
The Mathematics of Logic