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Reference.org
Brjuno number
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, a Brjuno number (sometimes spelled Bruno or Bryuno) is a special type of <a href="/facts/Irrational_number/Psv19TET">irrational number</a> named for Russian mathematician <a href="/facts/Alexander_Bruno/NuCwt3Ey">Alexander Bruno</a>, who introduced them in Brjuno (1971). </p>