The Bott generator of the homotopy group π2k-1U（∞） is used to construct an almost complex structure on S^6, which is integrable except a small neighborhood.
基金Project supported by the Changjiang Scholars Programthe Outstanding Youth Foundation of China (No. 19925103, No. 10229101)the National Natural Science Foundation of China (No. 10531090).
文摘The Bott generator of the homotopy group π2k-1U（∞） is used to construct an almost complex structure on S^6, which is integrable except a small neighborhood.
