Question: Why does Maple automatically assumes delta=1?

I did the following:

restart;
HARA := t->(alpha+delta*t)^(1-(beta)/(delta)):
0 < (beta)/(delta), (beta)/(delta) < 1:
0 < (alpha+delta*t);
 

Now Maple prints the last assumption like:

0 < alpha*t

thus assuming that delta must equal 1.

 

Why?

 

Thanks for helping.

 

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