SADI Muslihuddin Abumuhammad Abdulloh ibni Mushrifuddin (1203/8, Sheroz—1292, hamon jo), shoir, nasrnavis va mutafakkiri fors-tojik. …
Mufassal »MUODILAI BESSEL
MUODILAI BESSEL, muodilai differensialii tartibi duyumi na- mudi kh*u” + khu’ + (kh2 + r2) u = 0-ro guyand, ki in jo parametr («indeks») r qimathoi ikhtiyori (kompleksi)-ro qabul karda metavonad. Mavsum ba astronomi nemis Fridrikh Bessel (1784^1846). Bisyor masalahoi fizikaro bo yorii Muodilai Bessel hal mekunand. Halhoi Muodilai Besselro …
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