Mathematics. the theorem that eix = cosx + isinx.
Mechanics. a formula for determining the maximum load that can be applied to a given column without causing it to buckle.
What’s The #’s Real Name?A hash has referred to stripes on military jackets since as early as 1910. But, in the 1980s, people started using hash to refer to the # symbol.
Origin of Euler's formula
First recorded in 1945–50; named after L. Euler
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019