MUODILAI LAGRANJ, muodilai Dalamber, muodilai differensialii oddii tartibi yakumro guyand, ki nisbat ba tagyiryobandahoi vobasta va novobasta khattist va chunin namud dorad:
in jo u’ – —♦ va /—funksiyahoi nisbat ba argumentashon dif- ferensionidashavandai dodashuda. Integrali umumii Muodilai Langrajro dar shakli parametri hangomi nisbat ba kh differensionidani muodila yoftan mumkin ast, ki on ba vositai kvadratura ifoda meshavad. Holati khususii Muodilai Langraj muodilai Klero meboshad. In muodilaro bori avval matematiki fransavi J. Dalamber muoina kardaast, vale dar ilm bo nomi J. L. Lagranj mamul gashtaast.