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sicp-all-tasks/sicp/2_002e15

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Exercise 2.15: 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 resistances than
par1. Is she right? Why?