## Nagoya Mathematical Journal

The Nagoya Mathematical Journal is published quarterly with the cooperation of Nagoya University. Since its inception in 1950, the journal has endeavored to publish research papers of the highest quality with appeal to the general mathematical audience. Advance Publication of articles online is available.

On classification of $\mathbb{Q}-Fano 3-folds of Gorenstein index 2. I Sur le théorème de produit relatif au degré topologique d'une application dans l'espace vectoriel topologique On the imbedding problem of normal algebraic number fields Invariants of finite reflection groups Duality between$D(X)$and$D(\hat X)\$ with its application to Picard sheaves