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Eva Lu Ator, another user, has also noticed the different intervals
computed by different but algebraically equivalent expressions. She
says that a formula to compute with intervals using Alyssa’s system
will produce tighter error bounds if it can be written in such a form
that no variable that represents an uncertain number is repeated.
Thus, she says,
par2 is a “better” program for parallel
par1. Is she right? Why?