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java - Recursively verifying if a string is a valid prefix expression? - Stack Overflow
[https://stackoverflow.com/questions/7742333/recursively-verifying-if-a-string-is-a-valid-prefix-expression] - - public:stevetao
How to determine if a prefix expression is valid or not? What are some examples - Quora
[https://www.quora.com/How-do-you-determine-if-a-prefix-expression-is-valid-or-not-What-are-some-examples] - - public:stevetao
lo.logic - What is the Complete Set of Shortest Axioms of Classical Conditional-Negation Propositional Calculus? - MathOverflow
[https://mathoverflow.net/questions/182338/what-is-the-complete-set-of-shortest-axioms-of-classical-conditional-negation-pr] - - public:stevetao