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<p>Actually NU was ranked 14th in 2006 when USN had applied math and math as separate fields. NU became unranked in 2008/2010 when USN categorized applied math as one of the math “specialties”. It’s rare a program just dropped from 14th to unranked in 2 years; it’s likely because applied math at NU is not part of math department or because USN decided to “disqualify” NU because its AM is in the engineering school.</p>