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Lecture Notes in Computer Science
We present a proof assistant designed to help learning formal proof, particularly in the system of Natural Deduction for First-Order Logic. The assistant handles formulas and derivations containing metavariables and allows to maintain a library of instanciable lemmas. It possesses a graphical interface presenting proofs as trees and handles multiple simultaneous derivations that can be dragged and dropped into one another. Currently at Northeastern University, Boston.doi:10.1007/978-3-319-07482-5_42 fatcat:tloqap55g5b23dm44ysd475bli