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Reference.org
Supnick matrix
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<p>A Supnick matrix or Supnick array – named after Fred Supnick of the <a href="/facts/City_College_of_New_York/pAP1n6fw">City College of New York</a>, who introduced the notion in 1957 – is a <a href="/facts/Monge_array/aDsXHHDg">Monge array</a> which is also a <a href="/facts/Symmetric_matrix/08CGwjNl">symmetric matrix</a>. </p>