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seen Jul 28 at 12:28

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
Have you seen math.stackexchange.com/a/61584/23243 and math.stackexchange.com/q/85656/23243 ?
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.