ISSAC 96 - Hypergeometric Function Representations Up
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Proper Sequences Previous Next

Previously, we computed by computing
.  Could we have computed
instead?  No.  Since applied to is

the which applies to would be

which is undefined.  The order of the shift and inverse shift operators is therefore important. 

Definition A sequence of shift and inverse shift operators , , , and is a proper sequence if the composition is defined.  Next



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