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The theory of ๐-rings
An integral domain <italic>R</italic> with quotient field <italic>Q</italic> is defined to be a <italic>Q</italic>-ring if <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="upper E x t Subscript upper R Superscript 1 Baseline left-parenthesis upper Q comma upper R right-parenthesis approximately-equals upper Q"> <mml:semantics> <mml:mrow> <mml:msubsup> <mml:mi>Ext</mml:mi> <mml:mi>R</mml:mi> <mml:mn>1</mml:mn> </mml:msubsup> <mml:mo>โก<!-- โก --></mml:mo> <mml:mo โฆ