On the Anti-canonical Geometry of Weak Q-fano Threefolds, Ii


By a canonical (resp. terminal) weak Q-Fano 3-fold we mean a normal projective one with at worst canonical (resp. terminal) singularities on which the anti-canonical divisor is QCartier, nef and big. For a canonical weak Q-Fano 3-fold V , we show that there exists a terminal weak Q-Fano 3-fold X , being birational to V , such that the m-th anti-canonical… (More)


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