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Re: What is understanding?

Is there some sort of presumption that the converse of every theorem
is true? Or, is "I breathe when I sleep", the same as "I sleep when I
breathe", to quote from Alice.
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According to what I rememeber:
The quote of Feynman (advice to himself on his last blackboard) was
"What I cannot create, I do not understand." (Phys Today 10 years ago)

Does it follow that one understands whatever he/she can create?

Cary
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Regards,
Jack

"I scored the next great triumph for science myself,
to wit, how the milk gets into the cow. Both of us
had marveled over that mystery a long time. We had
followed the cows around for years - that is, in the
daytime - but had never caught them drinking fluid of
that color."
Mark Twain, Extract from Eve's
Autobiography