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Apr
25
comment What's the use of Malgrange preparation theorem?
@SönkeHansen Actually, the Malgrange preparation theorem and the Malgrange-Ehrenpreis theorem are not unrelated. The former came as a spinoff of of Malgrange's work on the latter, as he tells us himself at the end of his book "Ideals of Differentiable Functions" (OUP, 1966). To quote, "In other words, every linear differential operator with constant coefficients has a temperate fundamental solution (i.e. one in $\mathscr{S}'$). This is mainly of historical interest (...). We have, however, given this here because it was the origin of a large part of the results contained in this book."
Apr
6
revised Applications of functional analysis beyond analysis(towards algebra, geometry, number theory…)
Added reference to previous comment
Apr
6
answered Applications of functional analysis beyond analysis(towards algebra, geometry, number theory…)
Apr
3
comment $L^{\infty}$ polynomial approximation
Chapter 3 of the book "Constructive Approximation" (Springer, 1993) by R.A. DeVore and G.G. Lorentz (the same guy from "Lorentz spaces") has a good discussion on best uniformly approximating polynomials, including the Remez algorithm mentioned by Asaf above.
Apr
3
revised Braided Hopf algebras and Quantum Field Theories
Incorrect statement removed
Apr
3
comment Braided Hopf algebras and Quantum Field Theories
Oops, wrote that by inertia... Just fixed that, sorry! Thanks for the warning!
Apr
2
answered Braided Hopf algebras and Quantum Field Theories
Mar
17
comment Quantum Grassmannians?
For a notion of a noncommutative Grassmannian, see the MO question mathoverflow.net/questions/168993/…
Mar
9
awarded  Enthusiast
Mar
1
revised What is the dual of an semidefinitely representable (SDR) cone?
Improved spacing in some formulas and removed some unnecessary line breaks to improve readability
Mar
1
suggested approved edit on What is the dual of an semidefinitely representable (SDR) cone?
Mar
1
revised More general than semidefinite program?
Small correction
Feb
26
revised More general than semidefinite program?
Added reference, small aesthetic improvement
Feb
26
revised Upper bound on the number of convex connected components of the complement of the zero set of a polynomial
Typos fixed, small aesthetic improvements
Feb
26
revised More general than semidefinite program?
Small aesthetic adjustments
Feb
26
awarded  Nice Answer
Feb
26
revised More general than semidefinite program?
Added explanation
Feb
23
revised More general than semidefinite program?
Small correction
Feb
22
revised More general than semidefinite program?
Small corrections
Feb
22
revised More general than semidefinite program?
Added explanation