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 Apr 15 comment What is the convergence criterion for linear fixed-point iteration in Banach space? @fgp, Banach fixed-point theorem gives only sufficient condition. I need a criterion. Note: in $\mathbb R^n$ BFP theorem gives $\|A\|<1$ which is much more restrictive than $\rho(A)<1$. Apr 15 asked What is the convergence criterion for linear fixed-point iteration in Banach space? Jan 7 asked Is it okay to write $f(x)^2$? Oct 21 awarded Student Oct 21 asked Skew-triangular (?) matrices and their properties Aug 6 awarded Teacher Feb 8 comment Find parameters for exponential function fitting to datapoints Feb 8 comment How to construct a polynomial with minimum deviation from zero on the complex region? Hm... Clearly, we can replace maximum over domain $\Omega$ by maximum over boundary $\partial\Omega$. What next? Feb 8 revised How to construct a polynomial with minimum deviation from zero on the complex region? edited tags Feb 8 asked How to construct a polynomial with minimum deviation from zero on the complex region? Feb 5 comment Numerically Efficient Approximation of cos(s) @Damien this is a real gem, thank you! Feb 5 awarded Supporter Jan 22 answered Diagonalizing a matrix for producing a orthogonal set of functions.