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  • [1] G. Gentzen, Untersuchungen über das logische Schliessen, Mathematische Zeitschrift, vol. 23 (1934), pp. 176–210, 405–431, DOI: http://dx.doi.org/10.1007/BF01201353 English translation: Investigation into logical deduction, pp. 68–131 of The Collected Papers of Gerhard Gentzen, ed. M. E. Szabo. North-Holland, Amsterdam, 1969.

  • [2] J. Harrison, Without loss of generality, [in:] S. Berghofer, T. Nipkow (eds.), Theorem-Proving in Higher Order Logics, vol. 5674 of Lecture Notes in Computer Science, Springer, Berlin (2009), pp. 43–59, DOI: http://dx.doi.org/10.1007/978-3-642-03359-9_3

  • [3] A. Indrzejczak, Natural Deduction, Hybrid Systems and Modal Logic, Springer, Dordrecht (2010), DOI: http://dx.doi.org/10.1007/978-90481-8785-0

  • [4] A. Indrzejczak, Natural Deduction, Internet Encyclopedia of Philosophy, (2015), URL: https://iep.utm.edu/nat-ded/ consulted 16.07.2020.

  • [5] S. Ja_skowski, On the rules of suppositions in formal logic, Studia Logica, vol. 1 (1934), pp. 1–32.

  • [6] D. Kalish, R. Montague, Logic: Techniques of Formal Reasoning, Harcourt Brace, New York (1964), also second edition with co-author G. Mar, Oxford University Press, 2001.

  • [7] J. Lucas, Introduction to Abstract Mathematics, 2nd ed., Rowman & Little_eld, Maryland, USA (1990).

  • [8] D. Makinson, Sets, Logic and Maths for Computing, 3rd ed., Undergraduate Topics in Computer Science, Springer, London (2020), DOI: http://dx.doi.org/10.1007/978-1-4471-2500-6

  • [9] D. Makinson, Relevance-sensitive truth-trees, [in:] Alasdair Urquhart on Nonclassical and Algebraic Logic and Complexity of Proofs, Outstanding Contributions to Logic, Springer, Berlin (2021), to appear.

  • [10] J. Pelletier, A brief history of natural deduction, History and Philosophy of Logic, vol. 20 (1999), pp. 1–31, DOI: http://dx.doi.org/10.1080/014453499298165

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