Teoria Doniczka: Byłby ktoś tak miły i sympatyczny i mi to wyjaśnił We know that: lim(x −> 0⁺)=1, lim(x −> 0⁻)=+∞ a) f is discontinous at 1 b) f is discontinous at 0 c) 0 is cluster point of Df d) 0 belongs to Df e) f has discontinuity I type at 0 f) f has discontinuity II type at 0 Niby b d f dobre