论文标题
还原模式。 Del Pezzo晶格2
Reduction mod. 2 of del Pezzo lattices
论文作者
论文摘要
对于均匀的晶格L,形式为v->(v.v)/2在(z/2) - 矢量空间l/2L上诱导二次形式q。对于与某些特定根系相关的晶格,我们显示了减少模式。 2诱导L的根与Q = 1的L/2L的向量之间的两次射击,以及O(L)/<-1>的同构对O(L/2L)。
For an even lattice L , the form v --> (v.v)/2 induces a quadratic form q on the (Z/2)-vector space L/2L . For the lattices associated to some particular root systems, we show that reduction mod. 2 induces a bijection between the roots of L and the vectors of L/2L with q=1 , and an isomorphism of O(L)/<-1> onto O(L/2L).