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4

A fix is to give System`Private`DerivativeX the NHoldAll attribute (which it probably should have, since it seems to be used as a dummy indexed variable): SetAttributes[System`Private`DerivativeX, NHoldAll] f[x_] = BesselI[0, 1.0 x]; f'[x] (* 1. BesselI[1, 1. x] *)


0

Wolfram let me know that this is not supported in the Wolfram cloud!


2

Not certain what is going on but you can work around with Interpolation. ifoo = Interpolation[ha, InterpolationOrder -> 1]; Show[ ListPointPlot3D[ha, PlotRange -> All, AxesLabel -> {"x", "y", "z"}, ImageSize -> Large], Plot3D[ifoo[x, y], Evaluate[Sequence @@ MapThread[Prepend, {ifoo["Domain"], {x, y}}]], PlotStyle -> Opacity[...


1

There is a simple workaround: ClearAll[a, x]; f = (4 x^2)/((-a^2 - 4 x^2 + a Sqrt[a^2 + 4 x^2]) (a^2 + 4 x^2 + a Sqrt[a^2 + 4 x^2])); Series[f, {x, 0, 1}, Assumptions -> Re[a] > 0] *-(1/a^2)+O[x]^2 * Series[f, {x, 0, 1}, Assumptions -> Re[a] < 0] *-(1/a^2)+O[x]^2 * The case $\Re a=0$ makes a trouble.


4

This is a major bug in version 12.0.0. Frankly, I am puzzled by why they didn't release a 12.0.1 to fix this ... for me it is a recurring major inconvenience. The file in which the settings are stored can be found in this directory: SystemOpen@FileNameJoin@{$UserBaseDirectory, "FrontEnd"} Close Mathematica before editing it. First try init.m. If it ...


2

That changed for the better in version 12.0. E.g. f[z_, n_] := 2^(n - 1)/Sqrt[z] (PolyLog[n, Sqrt[z]] - PolyLog[n, -Sqrt[z]]); FullSimplify[Series[HurwitzLerchPhi[1-Sqrt[z],3,1/2]-f[1-Sqrt[z],3],{z,0, 8}],0<z<1] $ O\left(z^{17/2}\right)$


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