ANALYTIC GEOMETRY 



PAIJT I 



CHAPTER I 

 INTRODUCTION 



MKTRIC CONCEIT! 



1. Number. A number is most simply interpreted as 



ressing the measurement of one quantity l>\ another 



*ame kind first chosen as a unit of measure ; 



: .c, or -K if the measuring unit is taken in the 



same sense as the thing measured; and negative, or -. if 



MMsurinir unit i> ukt-n in the opposite sense. 

 / no unit </ "lldr may be regarded as a dollar of assets, 

 or as a doll. .Ulities; if it is regarded as a dolla 



asset*, then assets measured l>y it produce positive numbers, 

 \\ hil- li.tiii lities measured by it produce negative numbers. 



ID above drtiniiion is consistent with the one usually 

 given; \ i/.. tiiat numbers are positive or negative according 

 icy are greater or less than zero. 



the operations of addition, subtraction, multiplication, 

 _rer powers, extracting roots, or any 

 combination of these operations, are performed upon pi 

 ii'.Tx. thr rr^uh in every case is a number ; it is 



TAW. Alt. OEOM. 1 



