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Reference.org
Universal quadratic form
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, a universal quadratic form is a <a href="/facts/Quadratic_form/l2n1jXPe">quadratic form</a> over a <a href="/facts/Ring_(mathematics)/JnCUXz63">ring</a> that represents every element of the ring. A non-singular form over a <a href="/facts/Field_(mathematics)/xAjAS4ko">field</a> which represents zero non-trivially is universal. </p>