Given a quadratic field K, we determine the number of quadratic extensions of K, which are unramified at all finite primes.

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Keywords Biquadratic fields, Unramified quadratic extensions
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Journal Rocky Mountain Journal of Mathematics
Spearman, B.K. (Blair K.), & Williams, K.S. (1995). Unramified quadratic extensions of a quadratic field. Rocky Mountain Journal of Mathematics, 25(2), 783–788. doi:10.1216/rmjm/1181072249