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Reference.org
Invariant of a binary form
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<p>In mathematical <a href="/facts/Invariant_theory/5fIUh9h3">invariant theory</a>, an invariant of a binary form is a polynomial in the coefficients of a <a href="/facts/Homogeneous_polynomial/WUHL7Kct">binary form</a> in two variables <i>x</i> and <i>y</i> that remains invariant under the <a href="/facts/Special_linear_group/rsahah9w">special linear group</a> acting on the variables <i>x</i> and <i>y</i>. </p>