TY - JOUR AU - T. Leżański TI - The Fredholm Theory of Linear Equations in Banach spaces JO - Studia Mathematica PY - 1953 SP - 244 EP - 276 VL - 13 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/sm-13-2-244-276/ DO - 10.4064/sm-13-2-244-276 LA - en ID - 10_4064_sm_13_2_244_276 ER -