This can be answered in two ways... If you're talking about Einstein's equation, then E=MC2. If you are wondering what E means, it stands for energy, so Einstein's equation means, "energy is equal to mass times the speed of light squared'.
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linearity is defined as the situation when all variable exponents are equal to one
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.
An equation is equal if you have a math problem on each side of an equal sign.
E=mc2 E=energy m=mass c=speed of light Einstein's equation states that Energy equal mass times the speed of light squared
If it doesn't have an equal sign, then it's not an equation.