[1] J. Bet Daoud, Fundamentals of mathematics, translation: Mohammad Mahdi Ebrahimi, 18, Payam Noor Publishing
House, 2007. [In Persian]
[2] G. H. Musaheb, Mathematical analysis, 6, Amir Kabir Publications, 1991. [In Persian]
[3] M. A. Khatami, About the principle of choice, Journal of Mathematics and Society, 7 no. 3 (2022) 103–125. [In Persian]
[4] V. Serpinski, Set theory, translation: Parviz Shahriari, Kharazmi Publications, 1978. [In Persian]
[5] K. Kuratowski and R. Engelking, An introduction to set theory and topology, translation: Majid Ashrafi, Sina Malvani, Mohammad Ali Ghirtamand, Shabahang Publications, 2018. [In Persian]
[6] A. Stewart and D. Tal, Fundamentals of Mathematics, translation: Mohammad Mahdi Ebrahimi, Academic Publishing Center, 2015. [In Persian]
[7] P. R. Aczel, Generalised set theory, logic, language and computation, 1 (Moraga, CA, 1994), CSLI Lecture Notes, CSLI Publ., Stanford, CA, 1996 1–17.
[8] R. R. Dipert, Set-theoretical representations of ordered pairs and their adequacy for the logic of relations, Canadian Journal of Philosophy, 12 no. 2 (1982) pp. 22.
[9] N. Delfan, A. Pishkoo, M. Azhini and M. Darus, Using fractal calculus to express electric potential and electric field in terms of staircase and characteristic functions, Eur. J. Pure Appl. Math., 13 no. 1 (2022) 19–32.
[10] K. Falconer, Techniques in fractal geometry, John Wiley & Sons, Ltd., Chichester, 1997.
[11] G. Frege, Grundgesetze der arithmetik, Jena: Verlag Hermann Pohle, 1893.
[12] T, George, Lectures in logic and set theory, 2, Set Theory, Cambridge Univ. Press. Proposition, 2003.
[13] C. P. Haynes and A. D. Roberts, Generalization of the fractal Einstein law relating conduction and diffusion on networks, Phys. Rev. Lett., 103 (2009).
[14] P. R. Halmos, Natural theory of collections, translation: Abdolhamid Dadaleh, Academic Publishing Center, 1980.
[15] M. R. Holmes, On ordered Pairs, math. boisestate, Princeton University Press, 1988.
[16] J. Ferreiros, Labyrinth of thought: a history of set theory and its role in modern mathematics, Birkh¨auser Basel, 1999 pp. 440.
[17] K. Devlin, Sets, functions and logic, an Introduction to abstract mathematics, (3rd ed.), Chapman & Hall/CRC Mathematics, Chapman & Hall/CRC, Boca Raton, FL, 2004.
[18] A. Kanamori, The mathematical import of Zermelo’sWell-Ordering theorem, Bull. Symbolic Logic, 3 (1997) 281–311.
[19] A. Kanamori, The empty set, the singleton, and the ordered pair, Bull. Symbolic Logic, 9 (2003) 273–298.
[20] S.-Y. T. Lin, Set theory and its applications, University Publishing Center, 1981.
[21] J. Madhusudana Rao, Products of sets: Ordered and unordered, Resonance, 21 (2016) 557–564.
[22] A. P. Morse, A theory of sets Pure and Applied Mathematics, XVIII, Academic Press, New York-London, 1965.
[23] B. Oyer, A history of mathematics (2nd ed.), New York: Wiley, 1991.
[24] W. V. Quine, The time of my life: an autobiography, CAMBRIDGE, MA, 1985 p. 499.
[25] M. R. Holmes, Elementary set theory with a universal set, Universit´e Catholique de Louvain, D´epartement de Philosophie, Louvain-la-Neuve, 1998.
[26] D. Scott and D. Mccarty, Reconsidering ordered pairs, Bull. Symbolic Logic, 14 (2008) no. 3 379–397.
[27] S. Satin and A. D. Gangal, Langevin equation on fractal curves, Fractals, 24 (2016) 7 pp.
[28] J. B. Rosser, Logic for mathematicians, McGraw-Hill Book Co., Inc., New York-Toronto-London, 1953.
[29] Wikipedia, Zermelo–Fraenkel set theory, (2021).