Leonhard Euler
(Swiss mathematician and physicist, 17071783) and his beautiful and
extraordinary formula that links the 5 fundamental constants in
Mathematics, namely, e, the base of the natural logarithms, i,
the square root of 1, Pi, the ratio of the circumference of a
circle to its diameter, 1 and 0, together!
Euler's Equation
Euler's formula
is a mathematical formula in complex analysis that
shows a deep relationship between the trigonometric
functions and the complex exponential function.
Euler's formula states that, for any real number x:
where
Euler's equation or
identity is a special case of the Euler'
formula, where:


Benjamin Peirce
(18091880, American mathematician, professor at Harvard) gave a
lecture proving "Euler's equation", and concluded:
"Gentlemen, that is
surely true,
it is absolutely
paradoxical;
we cannot understand
it,
and we don't know
what it means.
But we have proved
it,
and therefore we
know it must be the truth."


See also:
Euler's Formula  Puzzle:
55 pieces in a six star style of piece.

Reference: The
Changing Shape of Geometry. Celebrating a Century of Geometry
and Geometry Teaching. Edited on behalf of The Mathematical
Association UK by Chris Pritchard. Cambridge University Press,
(Cambridge 2003).
