I BOB. XUSUSIY HOSILALI DIFFERENSIAL TENGLAMALAR HAQIDA UMUMIY TUSHUNCHALAR1.1-§ Xususiy hosilali differensial tenglamalar............................................51.2-§ Xususiy hosilali differensial tenglamalar va ularning yechimi to’g’risida tushuncha.............................................................................................181.3-§ Ikkinchi tartibli differensial tenglamalarning klassifikatsiyasi va kanonik ko’rinishga keltirish................................................................................