plotting - Problem with thickness in 3D plots

I'm facing a problem with Mathematica 11.1.1 on MacOS (2016 Macbook Pro). The Thickness and AbsoluteThickness options in PlotStyle do not scale consistently. There is a "jump" around the value AbsoluteThickness[3] (for Thickness the value depends on the image size).

ParametricPlot3D[{{Cos[t], Sin[t], .2}, {Cos[t], Sin[t], -.2}}, {t, 0, 10}, 
PlotRange -> {{-1, 1}, {-1, 1}, {-1, 1}}, 
PlotStyle -> {AbsoluteThickness[3.00001], AbsoluteThickness[3.]}]

The problem is visible in the notebook and also in files exported with the command Export, independently of the type (vector PDF, PNG,...) and or resolution (see image below).

This is a regression, because I have notebooks written in version 10 that do not have the problem, but the problem occurs if I reevaluate them with this version. I can't say if the problem was introduced in v11 or in a successive release. The problem is not there on a Ubuntu setup with Mathematica 11.1.1.

Can anyone reproduce this?

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front end - keyboard shortcut to invoke Insert new matrix

I frequently need to type in some matrices, and the menu command Insert > Table/Matrix > New... allows matrices with lines drawn between columns and rows, which is very helpful. I would like to make a keyboard shortcut for it, but cannot find the relevant frontend token command (4209405) for it. Since the FullForm[] and InputForm[] of matrices with lines drawn between rows and columns is the same as those without lines, it's hard to do this via 3rd party system-wide text expanders (e.g. autohotkey or atext on mac). How does one assign a keyboard shortcut for the menu item Insert > Table/Matrix > New... , preferably using only mathematica? Thanks! Answer In the MenuSetup.tr (for linux located in the $InstallationDirectory/SystemFiles/FrontEnd/TextResources/X/ directory), I changed the line MenuItem["&New...", "CreateGridBoxDialog"] to read MenuItem["&New...", "CreateGridBoxDialog", MenuKey["m", Modifiers-...

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Given a function f[x] , I would like to have a function leadingSeries that returns just the leading term in the series around x=0 . For example: leadingSeries[(1/x + 2)/(4 + 1/x^2 + x)] x and leadingSeries[(1/x + 2 + (1 - 1/x^3)/4)/(4 + x)] -(1/(16 x^3)) Is there such a function in Mathematica? Or maybe one can implement it efficiently? EDIT I finally went with the following implementation, based on Carl Woll 's answer: lds[ex_,x_]:=( (ex/.x->(x+O[x]^2))/.SeriesData[U_,Z_,L_List,Mi_,Ma_,De_]:>SeriesData[U,Z,{L[[1]]},Mi,Mi+1,De]//Quiet//Normal) The advantage is, that this one also properly works with functions whose leading term is a constant: lds[Exp[x],x] 1 Answer Update 1 Updated to eliminate SeriesData and to not return additional terms Perhaps you could use: leadingSeries[expr_, x_] := Normal[expr /. x->(x+O[x]^2) /. a_List :> Take[a, 1]] Then for your examples: leadingSeries[(1/x + 2)/(4 + 1/x^2 + x), x] leadingSeries[Exp[x], x] leadingSeries[(1/x + 2 + (1 - 1/x...

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