scholarly journals SPIEGELUNGSSATZ: A COMBINATORIAL PROOF FOR THE 4-RANK

2011 ◽  
Vol 07 (08) ◽  
pp. 2157-2170
Author(s):  
LAURENT HABSIEGER ◽  
EMMANUEL ROYER

The Spiegelungssatz is an inequality between the 4-ranks of the narrow ideal class groups of the quadratic fields [Formula: see text] and [Formula: see text]. We provide a combinatorial proof of this inequality. Our interpretation gives an affine system of equations that allows to describe precisely some equality cases.

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