Borcea's normal-matrix invertibility conjecture
Borcea's normal-matrix invertibility conjecture
Let be a normal matrix, let be an orthonormal basis, and let denote the orthogonal projection onto . Write
for the corresponding compressions.
Borcea's normal-matrix invertibility conjecture. If every eigenvalue of every lies outside the unit disk and
for all , then is invertible.
The statement is identified as the matrix-theoretic reduction of Statement (i), and hence as equivalent to the 2-variance conjecture in the surrounding discussion. The source provides no proof or disproof.
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Sources & referencesView supporting material
Primary source
Dmitry Khavinson, Rajesh Pereira, Mihai Putinar, Edward B. Saff and Serguei Shimorin, “Borcea's variance conjectures on the critical points of polynomials”, arXiv:1010.5167 (2011).
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