Mathematical a priori Statements

 

Mathematical a priori Statements 

    A triangle having three sides and angles equaling 180 degrees is an analytic a priori since the predicate of 3 sides and 180 degrees are in the word triangle. The equation, 2+2=4, would be a synthetic a priori because the concept of four is not present in two. 
    In the case of a triangle having three sides and angles equaling 180 degrees, the concept of a triangle already contains within it the idea of having three sides and angles adding up to 180 degrees. All three-sided polygon has 180 degrees and all triangles are three-sided polygons by definition. Therefore, the truth of this statement is considered analytic a priori, as it is true by definition and can be known independently of experience unless it can be proven otherwise. 
    On the other hand, in the case of 2+2=4, the concept of four is not contained within the concept of two. Rather, the truth of this statement is established through logical deduction and requires the use of concepts that are not contained within the original terms. Therefore, this statement is considered synthetic a priori, as it involves combining concepts in a novel way and can be known independently of experience. 
    It could be argued that 2+2=4 is also analytic a priori since the concept of four is already contained within the concepts of two and addition together. However, while this may be true, the concept of addition itself is not contained within the concept of two. This involves combining concepts in a way that goes beyond the definitions of the individual terms. 
    A rebuttal to this may state that it is true that the concept of four is not explicitly contained within the concept of two, it can still be considered analytic a priori because the concept of addition, which is necessary to arrive at the answer of four. However, since the concept of addition is also required, this would make it synthetic because addition is not an innate quality of two. Although two can be added to itself to produce the result of four, this relationship is not inherent in the concept of two itself. The concept of addition is a separate concept that must be introduced in order to arrive at the truth of the statement 2+2=4. Therefore, mathematics can be both synthetic and analytic a priori.

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