Educação Superior::Ciências Exatas e da Terra::MatemáticaThe pq-system [1] is a formal system in which theorems can be derived or generated from axioms or from other theorems by using a rule of inference. Use only the upper sliders to adjust the "pq-string" and test whether it is an axiom or a theorem or neither. (Axioms must follow the axiom schema or pattern "xp-qx", where x represents a string of hyphens.) This Demonstration is a power tool for exploring this sample formal system, but the exploration process occurs in your own mind: do not use the lower slider or buttons until you have thoroughly explored the system or you short-circuit the process