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> Although there are good reasons to avoid floats while doing symbolic calculations, think about (-1)^(2/3) (using the real branch rule) vs (-1)^*0.66666...7.
I mangled the logic in the last sentence--try:
There are good reasons to avoid floats while doing symbolic calculations: think about (-1)^(2/3) (using the real branch rule) vs (-1)^*0.66666...7.
--Barton