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added 252 characters in body

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edited Aug 3, 2019 at 19:21

What do you mean by the "envelope" of the $\mathcal{E}_1$ set of ellipses?

[![Ellipses][1]][1]
^{$\mathcal{E}_1$: $a=1$; $e=0,0.1,\ldots,0.9,1$.}

Added after OP change, now $\mathcal{E}$:

[![Ellipses2][2]][2]
^{$a=2$; $e=0,0.1,\ldots,a$.}

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created Aug 3, 2019 at 17:56

What do you mean by the "envelope" of the $\mathcal{E}_1$ set of ellipses?

[![Ellipses][1]][1]
^{$\mathcal{E}_1$: $a=1$; $e=0,0.1,\ldots,0.9,1$.}