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Results tagged with number-fields
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user 105957
9
votes
Accepted
Fields in which $ -1 $ can't be written as sum of two square elements
In the notation of Lam's Quadratic forms over fields, the Stufe (a German word) or level (its English translation) $s(F)$ of a field is the minimal $n$ such that $-1$ is the sum of $n$ squares.
A theo …
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