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If, for example, I have independent ways to define the quantities
force, mass and acceleration (not a trivial task), then the equation
F=ma is a statement about the result of three different measurents, as
John stated. When, on the other hand, I write: 6=3x2 I am stating that
the number 6 <is the same as> the product of the numbers 3 and 2. These
are, conceptually, two different uses of the equal sign.