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#PROBLEM-123651

#PROBLEM-123651

Can the validity of a model be limited, or must it be universally valid?

Models cannot be valid because they do not describe nature.

It can be limited, for example, Kepler's model of plenary motion.

A model must always be universally valid to be considered true.

KEY2PHYSICS was built using technology and resources developed by National Science Foundation funding under NSF Award Numbers 0937989, 1418163, and 1742083.

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