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Introduction
	
 
Structure of "Use of Number" (Examples)
	
	
Structure of "Use of Number" :  Position-Quantity-Number
	
 
Arithmetic Laws at Position-Quantity-Number
	
 
Point-Vector-Scalar
	
 
Number as "Ratio between Two Quantities"
	
 
Set/Structure-Theoretic View of Position-Quantity-Number
	
 
Review
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