An elementary proof of the exponential conditioning of real Vandermonde matrices
Stefano Serra‐Capizzano · IrInSubria (University of Insubria) · 2007
We provide and discuss an elementary proof of the exponential conditioning of real Vandermonde matrices which can be easily given in undergraduate courses: we exclusively use the definition of conditioning and the sup-norm formula on [-1,1] for Chebyshev polynomials of first kind The same proof idea works virtually unchanged for the famous Hubert matrix.