Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neron-Severi group preserving lifting of K3 surfaces and applications   For a K3 surface of finite height over a field of odd characteristic, there
exists a smooth lifting to the ring of Witt vectors such that the reduction map
from the Picard group of the generic fiber to the Picard group of the special
fiber is isomorphic. In this paper, using this result, we give a criterion for
a K3 surface of finite height over a field of odd characteristic to be an
Enriques K3 surface or to be a K3 surface in terms of the Neron-Severi lattice.
Then we show every Kummer surface has an Enriques involution. We also give a
classification of K3 surfaces of Picard rank of 20 over odd characteristic.

33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
16
The categories of this paper are: stat
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an