Historical remarks on equivalence of functions
Bulletin Polish Acad. Sci. Math. 65 (2017), 93-95 MSC: 28A05, 28A20, 26A99. DOI: 10.4064/ba8107-4-2017 Published online: 28 April 2017
A theorem of E. Szpilrajn (Marczewski) (1936) on equivalent functions is recalled and its relation to subsequent results published by M. Morayne and C. Ryll-Nardzewski (1999) and M. Kysiak (2005) is briefly discussed.