Re: Circles and ellipses

Robert,

> This is the essential problem that the LSP (Liskov Substitution
> Principle) tries to resolve; or at least identify. Clients of a base
> class can be confounded by certain derivatives that appear natural.

Thank you! Your explanation was most lucid, concise, and simple enough for me to follow.
It was very useful to me. I hope it's similarly useful to others.

--
Regards,
    David Cressey
    www.dcressey.com