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The aim of this note is to give an elementary formulation of Tomio Kubota'sproof of Satz 4 in his paper in Nagoya Math. t. 10 (1956) since thisproposition is a cornerstone for the computation of the order of the Polyagroup of the biquadratic number fields.

An elementary formulation of Kubota's proof of Satz 4 about biquadratic number fields