On the exponents of differential ideals 
By: by Ellis Robert Kolchin.
Published: 1941
Place of publication: New York
Language: eng
Number of pages: 777
Subjects: Differential forms.; Algebraic fields.
Notes: Thesis (Ph. D.)--Columbia University, 1941.
"Reprinted from Annals of mathematics, vol. 42, no. 3, July, 1941."
Vita.