A form of formula that no variable that represents an uncertain number is repeated
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?