Novel Didactic Proof Assistant for First-Order Logic Natural Deduction

@inproceedings{Pais2014NovelDP,
  title={Novel Didactic Proof Assistant for First-Order Logic Natural Deduction},
  author={Jorge Pais and {\'A}lvaro Tasistro},
  booktitle={HCI},
  year={2014}
}
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 meta-variables 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. 

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