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Special functions, orthogonal polynomials, harmonic analysis, ordinary differential equations (ODE's), differential relations, calculus of variations, approximations, expansions, asymptotics.

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A (non trivial) continuous map on a Banach space which is nowhere Frechet differentiable

From http://thaijmath.in.cmu.ac.th/index.php/thaijmath/article/viewFile/285/416 Fr\'echet differentiability implies G\^ateaux differentiability, but the converse is true only for finite-dimensional B …
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