As I understand it, the Nakai-Moishezon criterion gives conditions for the existence of an ample divisor class on an arbitrary proper scheme, and Kleiman's criterion does the same for arbitrary projective schemes (in fact, more generally for 'quasi-divisorial' schemes, as defined in Kleiman's paper).


Are there similar numerical criteria for other 'nice' classes of spaces? In particular, what about Moishezon manifolds? These are not quite schemes, but on the other hand, they *nearly* are, and they are smooth, so one might hope for a useful result.



Do versions of the Nakai-Moishezon and Kleiman criteria hold for Moishezon manifolds, or other 'nice' spaces?
This is adding to ulrich's comment. One reference for this result is the following article of Kollár.


MR1064874 (92e:14008) Reviewed
Kollár, János(1-UT)
Projectivity of complete moduli.
J. Differential Geom. 32 (1990), no. 1, 235–268.
14D22 (14H10 14J10)


<http://projecteuclid.org/DPubS?service=UI&version=1.0&verb=Display&handle=euclid.jdg/1214445046>


**Edit.** Although you did not ask about this, also Seshadri's criterion has been extended to algebraic spaces. Here is one reference by Cornalba.


MR1241126 (94i:14031) Reviewed
Cornalba, M. D. T.(I-PAVI)
On the projectivity of the moduli spaces of curves.
J. Reine Angew. Math. 443 (1993), 11–20.
14H10 (14D22)


<http://www.degruyter.com/view/j/crll.1993.issue-443/crll.1993.443.11/crll.1993.443.11.xml>


