How to detect that a function argument is the default one

[Ian Kelly]

On Thu, Dec 11, 2014 at 3:02 AM, Jean-Michel Pichavant <
jeanmichel at sequans.com> wrote:
> I would advise to remove the the mass parameter of your Sphere
initialization. It could be inconsistent with the radius.
> To compute the mass you would need the radius and the  volumetric mass
density.

You assume a three-dimensional universe. Clearly this is a two-dimensional
"ball" with a density equal to pi/2 mass units per area unit.
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