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e, or Euler's number, is roughly equal to 2.718. For more information, see the related link.
e is also used to refer to other properties. In the following famous equation, e refers to energy:
enegy= mass x the speed of light squared which for short is e=mc2
E in the equation "E = mc^2" refers to "Energy".
m refers to mass.
c is the speed of light.
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