54 SCIENCE ABSOLUTE OP SPACE. 



f 



^ 



(a+b) -(a+b) a-b -(a-b) ") 



\ + e i + e i + e i J 

 follows (for w, z;, A taken like ^) 



And hence 



C 2 =- 



which =a 2 +l> 2 . 



