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Redheffer matrix

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In mathematics, a Redheffer matrix, studied by Redheffer (1977), is a matrix whose entries aij are 1 if i divides j or j=1.

References

Redheffer, Ray (1977), "Eine explizit lösbare Optimierungsaufgabe", Numerische Methoden bei Optimierungsaufgaben, Band 3 (Tagung, Math. Forschungsinst., Oberwolfach, 1976), Basel, Boston, Berlin: Birkhäuser, pp. 213–216, MR0468170

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