
Like
“Pi Day” (March 14), “e Day” celebrates one of the most
famous and useful irrational numbers. “Irrational” means “not
rational,” and in math it refers to numbers that cannot be
expressed as simple fractions, or ratios.
The
irrational number e
starts
out 2.7182818284590452353602874713527...but
it goes on and on without stopping or repeating a pattern. Because
the first two numbers are 2 and 7, we celebrate e
on 2/7, or February 7.


(By
the way, the logarithm of a number is the exponent by which the base
must be raised to produce that number. Logarithms are useful in
science, engineering, calculus, and computer science.)
For
more about this irrational number, check out Math Is Fun.
Also
on this date:
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