Part of the Die Grundlehren der mathematischen Wissenschaften book series (GL, volume 144)
We shall need some elementary results about vector-spaces over Q, involving the following concept:
Definition 1. Let E be a vector-space of finite dimension over Q. By a Q-lattice in E, we understand a finitely generated subgroup of E which contains a basis of E over Q.
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© Springer Science+Business Media New York 1973