01220nam a2200349 i 4500991001713849707536150512s2007 us a b 001 0 eng d97808176453599780817645366b14057931-39ule_instDip.to Matematica e Fisicaeng517.9AMS 35J20AMS 35J25AMS 35J60AMS 58E05AMS 34L30AMS 55M05LC QA371.C78Costa, David G.477016An invitation to variational methods in differential equations /David G. CostaBoston :Birkhäuser,c2007xii, 138 p. :ill. ;24 cmTextbook for graduatesIncludes bibliographical references (p. [131]-134) and indexDifferential equations.b1405793102-04-1415-05-12991001713849707536LE013 35J COS11 (2007)12013000215341le013pE44.95-l- 02020.i1543106x04-07-12Invitation to variational methods in differential equations238600UNISALENTOle01315-05-12ma -engus 30