As commonly understood and reinforced here, 2 + 2 = 4 is taken as meeting the

As commonly understood and reinforced here, 2 + 2 = 4 is taken as meeting the

As commonly understood and reinforced here, 2 + 2 = 4 is taken as meeting the test for absolute certainty. This appears to be true in a formal or symbolic sense but is it true in reality? When we count two things as being the same and add them to two other same things do we really get four identical things? Perhaps, perhaps not; it may depend on one's identity theory. Do we know with absolute certainty when we have one thing and not two? What am I missing?

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