Quadratic residue covers for certain real quadratic fields
Quadratic residue covers for certain real quadratic fields
Let <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="normal upper Delta Subscript n Baseline left-parenthesis a comma b right-parenthesis equals left-parenthesis b a Superscript n Baseline plus left-parenthesis a minus 1 right-parenthesis slash b right-parenthesis squared plus 4 a Superscript n"> <mml:semantics> <mml:mrow> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msub> <mml:mi mathvariant="normal">Δ<!-- Δ --></mml:mi> <mml:mi>n</mml:mi> </mml:msub> </mml:mrow> …