+0  
 
0
44
1
avatar+4690 

Help 4

 Dec 17, 2018
 #1
avatar+94526 
+2

C.  phi   

 

[ However....the lowercase usually denotes the reciprocal of the  ratio...."Phi" usually denotes the ratio itself ]

 

 

cool cool cool

 Dec 17, 2018

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