You are fascinated by the equation .
You know by heart the first fifty digits of
You have tried to prove Fermat's Last Theorem.
You know ten ways to prove Pythagoras' Theorem.
Your telephone number is the sum of two prime numbers.
You have calculated that the World Series actually diverges.
You are sure that differential equations are very useful tool.
You comment to your wife or girl friend/ boy friend that her/his hair is nice and parallel.
When you say to a car dealer, "I'll take the red car or the blue one," you must add " but not both of them."