Weierstrass, Cantor, na Heine nalai pammikkiranna pole ri seri de'na ma'gangka, naikiya Dedekind nasappai pammikkiranna pole ri seddi polongang (Schnitt) ri sistem bilangang asli, passarang maneng nomoro' rasional'e mancaji duwa kelompo na punna karaterna masing-masing.