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Kodaira dimension of irregular varieties

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Let f:XY be an algebraic fiber space with general fiber F. If Y is of maximal Albanese dimension, we show that κ(X)≥κ(Y)+κ(F).

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Correspondence to Christopher D. Hacon.

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We are in debt to O. Debarre, Z. Jiang, R. Lazarsfeld, J. Kollár, M. Popa and the referee for many useful comments and suggestions. The first author was partially supported by TIMS, NCTS/TPE and National Science Council of Taiwan. The second author was partially supported by NSF Grant 0757897.

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Chen, J.A., Hacon, C.D. Kodaira dimension of irregular varieties. Invent. math. 186, 481–500 (2011). https://doi.org/10.1007/s00222-011-0323-x

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