TY - JOUR TI - Has every symmetric operator a closed symmetric restriction whose square has a trivial domain? T3 - Acta scientiarum mathematicarum AU - Brasche Johannes-Friedemann PY - 1993 LA - English SN - 0001-6969 UR - http://acta.bibl.u-szeged.hu/15444/1/math_058_425-430.pdf ER -