Geometric characterization of strongly normal extensions. Trans. AMS Vol 358, Number 9 (2006) 4135-4157
geomsn.dvi      geomsn.tex

The differential Galois theory of strongly normal extensions. Trans. AMS Vol 355, Number 11 (2003) 4475-4522
diffgalois.dvi      diffgalois.tex

Cyclic vectors (with R. C. Churchill), Differential Algebra and Related Topics, Proceedings of the International Workshop, Rutgers University, Newark, November 2-3. World Scientific Publishing Co., River Edge, NJ, 2002.
cvt.dvi      cvt.tex

Global sections of diffspec, J. Pure and Applied Alg., 171 (2002), 265-288
global.dvi      global.tex

Differential Schemes, Differential Algebra and Related Topics, Proceedings of the International Workshop, Rutgers University, Newark, November 2-3. World Scientific Publishing Co., River Edge, NJ, 2002.
diffschemes.dvi      diffschemes.tex

Differential Schemes - errata;
diffschemes-err.dvi      diffschemes-err.tex

An algorithm for solving second order linear homogeneous differential equations, J. Symbolic Comput. 2 (1986), 3-43.
Link to a scan

Constrained cohomology, in Contributions to Algebra: A Collection of Papers dedicated to Ellis Kolchin, Academic Press, New York, (1977), 251-266.

Contributions to Algebra: A Collection of Papers dedicated to Ellis Kolchin, Academic Press, New York, (1977). Coeditor with H. Bass and P. J. Cassidy

On the inverse problem of Galois theory, Trans. Amer. Math. Soc. 207 (1975), 375-390.
Link to JSTOR

Pro-algebraic groups and the Galois theory of differential fields, Amer. J. Math. 45 (1973), 507-536.
Link to JSTOR

An Eisenstein criterion for noncommutative polynomials, Proc. Amer. Math. Soc. 34 (1972), 25-29.
Link to JSTOR

On the inverse problem in the Galois theory of differential fields II, Ann. of Math. 93 (1971), 269-284.
Link to JSTOR

The inverse problem in the Galois theory of differential fields, Ann. of Math. 89 (1969), 583-608.
Link to JSTOR

Last updated August 7, 2005