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There is a fairly widespread belief that the problem of existence is not an essential issue for logic. Logic, though formal, must deal with the problem of existence. However, logic should be limited to describing "formal existence" or "existence of a formal system". However, the logical problem of existence and how to treat and resolve this problem differ completely from the corresponding metaphysical problem. It is possible to deduce that formal existence is nothing other than belonging to thedoi:10.3390/math6110272 fatcat:2b2lf36xtnbl5os7qexpbglswa