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Is there some tool or website to draw intervals like this?

enter image description here

It would also be helpful if I can draw more than one interval in order to see the intersection of $2$ or more intervals.

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  • $\begingroup$ TeX.SE might be the place to go. $\endgroup$ Commented Apr 16, 2020 at 6:34

1 Answer 1

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Mathematica

      Graphics[

     {Red, BSplineCurve[{{-30, 10}, {-6.1, 10}, {-6, 0}}], 
      Green, BSplineCurve[{{-6, 0}, {-1, 18}, {5, 0}}], 
      Blue, BSplineCurve[{{5, 0}, {10, 11}, {20, 10}}],
      Black, PointSize[0.02], 
      Point[{-6, 0}], Point[{5, 0}]}, 

      Ticks -> None,
      Text[Style["x", 28, Italic, FontFamily -> "Times"], {22, 0}]},
      Axes -> None]

enter image description here

By the way, Mathematica has wonderful tools for drawing intervals, with lots of style variations, but alas none like the BSpline curves you desire (which, frankly, I've never seen).

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  • $\begingroup$ Thank you for the response! Can we hide the y-axis and "full" the points. $\endgroup$ Commented Apr 16, 2020 at 6:45

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