抄録
The purpose of this paper is to clarify the claim made in the Critique of Pure Reason that "7+5=12" is a synthetic judgment and to explain what argument supports this claim. In my interpretation, each concept of number is understood as a rule for representing those numbers in intuition. The relation of inclusion/exclusion between number concepts is understood on the basis of the identity of the procedures for representing the numbers following each number concept. Consequently, it is argued that "7+5=12" is synthetic because the procedure following the concept "7+5" does not include the procedure following the concept "12".
