220 DR THOMAS MUIR ON THE DIFFERENTIATION OF A CONTINUANT. 



the second being got from the first by changing the signs of the 1st, 3rd, 5th columns 

 and then exchanging the latter with the 2nd, 4th, 6th columns respectively, we find 

 the product to be 



/ 

 ef+1 



This is zero-axial skew, and a fair approximation to the form required ; but the further 

 changes necessary are too many in number to be worth noting. 





at> + 1 



— a 







-ab-1 





2 



d 



-1 



a 



-2 





cd+\ 



- c 





-d 



-cd-l 





2 





1 



c 



-2 



-/ 



-e/- 



15 MAR 1902 



