[Authors] Apushkinskaya, D. E.; Uraltseva, N. N. [Title] On regularity properties of solutions to hysteresis-type problems [AMS Subj-class] 35R35 Free boundary problems 47J40 Equations with hysteresis operators 35B65 Smoothness and regularity of solutions [Abstract] In this short notes we formulate several statements about optimal regularity of solutions to hysteresis-type problems. [Keywords] free boundary, hysteresis, optimal regularity [Comments] LaTeX, English, 5 pp. [Contact e-mail] darya@math.uni-sb.de