In recent years new topological methods, especially the theory of
sheaves founded by J. LERAY, have been applied successfully to algebraic
geometry and to the theory of functions of several complex variables. H.
CARTAN and J. -P. SERRE have shown how fundamental theorems on
holomorphically complete manifolds (STEIN manifolds) can be for- mulated
in terms of sheaf theory. These theorems imply many facts of function
theory because the domains of holomorphy are holomorphically complete.
They can also be applied to algebraic geometry because the complement of
a hyperplane section of an algebraic manifold is holo- morphically
complete. J. -P. SERRE has obtained important results on algebraic
manifolds by these and other methods. Recently many of his results have
been proved for algebraic varieties defined over a field of arbitrary
characteristic. K. KODAIRA and D. C. SPENCER have also applied sheaf
theory to algebraic geometry with great success. Their methods differ
from those of SERRE in that they use techniques from differential
geometry (harmonic integrals etc. ) but do not make any use of the
theory of STEIN manifolds. M. F. ATIYAH and W. V. D. HODGE have dealt
successfully with problems on integrals of the second kind on algebraic
manifolds with the help of sheaf theory. I was able to work together
with K. KODAIRA and D. C. SPENCER during a stay at the Institute for
Advanced Study at Princeton from 1952 to 1954.