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Not so fast, Ms. Math Teacher.
"As far as the propositions of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality."
-- Albert Einstein
"Although this may seem a paradox, all exact science is based on the idea of approximation. If a man tells you he knows a thing exactly, then you can be safe in inferring that you are speaking to an inexact man."
-- Bertrand Russell
Reality works more like this:
"Faith is to believe what we do not see. The reward of this faith is to see what we believe."
-- Saint Augustine