TY - JOUR AU - J. Nagata TI - On the countable sum of zero-dimensional metric spaces JO - Fundamenta Mathematicae PY - 1959 SP - 1 EP - 14 VL - 48 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/fm-48-1-1-14/ DO - 10.4064/fm-48-1-1-14 LA - en ID - 10_4064_fm_48_1_1_14 ER -