This work was supported by the National Natural Science Foundation of China(Grant No.10371008);a grant of Jingshi Scholar of Beijing Normal University.
There are three key ingredients in the study of the minimal genus problem for rational surfaces CP2#nCP2: the generalized adjunction formula, the action of the orthogonal group of the Lorentz space and the geometric c...
supported by the National Natural Science Foundation of China(Grant No.10371008).
Let σ be an anti-holomorphic involution on an almost complex four manifold X,a necessary and sufficient condition is given to determine weather X/σ admits an almost complex structure.