An integral lattice $L$ is **positive definite** if the Gram matrix of the bilinear form $B$ on $L$ is a positive definite matrix. This is equivalent to the condition that $B(u,u)>0$ for all $u \in L \setminus\{0\}$.

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- Last edited by Kiran S. Kedlaya on 2018-06-19 03:02:22

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- 2018-06-19 03:02:22 by Kiran S. Kedlaya (Reviewed)