Timeline for Diagonalizing a Certain Real and Symmetric Toeplitz Matrix

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Jun 22, 2011 at 18:38	comment	added	Noam D. Elkies		It's at least positive definite for α in (-1,1), being proportional to the Gram matrix of the first n vectors of the following sequence of vectors in l2: $(1,α,α^2,α^3,α^4,...)$, $(0,1,α,α^2,α^3,...)$, $(0,0,1,α,α^2,...)$, $(0,0,0,1,α,...)$, etc.
Jun 22, 2011 at 14:44	history	answered	greg coxson	CC BY-SA 3.0