# Problem with rename_dummies and sort_product

+1 vote

Hello,

With the input

{a,b,c#}::Indices("a");

ex:=1/2 X_{a} B^{a b} X_{b} + K^{a} X_{a};
vary(ex,$X_{a}->A_{a}$);
sort_product(ex);
rename_dummies(ex);

{\delta{#},Z{#},X{#},B{#},K{#}}::SortOrder;

ex:=1/2 X_{a} B^{a b} X_{b} + K^{a} X_{a};
vary(ex,$X_{a}->Z_{a}$);
sort_product(ex);
rename_dummies(ex);

\delta{#}::Accent;

ex:=1/2 X_{a} B^{a b} X_{b} + K^{a} X_{a};
vary(ex,$X_{a}->\delta{X_{a}}$);
sort_product(ex);
rename_dummies(ex);


The output I get is

Attached property Indices(position=free) to {a, b, c#}.
1/2 X_{a} B^{a b} X_{b} + K^{a} X_{a}
1/2 A_{a} B^{a b} X_{b} +  1/2 X_{a} B^{a b} A_{b} + K^{a} A_{a}
1/2 A_{a} B^{a b} X_{b} +  1/2 A_{b} B^{a b} X_{a} + A_{a} K^{a}
1/2 A_{a} B^{a b} X_{b} +  1/2 A_{a} B^{b a} X_{b} + A_{a} K^{a}
Attached property SortOrder to {\delta(#), Z(#), X(#), B(#), K(#)}.
1/2 X_{a} B^{a b} X_{b} + K^{a} X_{a}
1/2 Z_{a} B^{a b} X_{b} +  1/2 X_{a} B^{a b} Z_{b} + K^{a} Z_{a}
1/2 Z_{a} X_{b} B^{a b} +  1/2 Z_{b} X_{a} B^{a b} + Z_{a} K^{a}
1/2 Z_{a} X_{b} B^{a b} +  1/2 Z_{b} X_{a} B^{a b} + Z_{a} K^{a}
Attached property Accent to \delta{#}.
1/2 X_{a} B^{a b} X_{b} + K^{a} X_{a}
1/2 \delta{X_{a}} B^{a b} X_{b} +  1/2 X_{a} B^{a b} \delta{X_{b}} + K^{a} \delta{X_{a}}
1/2 \delta{X_{a}} X_{b} B^{a b} +  1/2 \delta{X_{b}} X_{a} B^{a b} + \delta{X_{a}} K^{a}
1/2 \delta{X_{a}} X_{b} B^{a b} +  1/2 \delta{X_{b}} X_{a} B^{a b} + \delta{X_{a}} K^{a}


Is this behaviour expected? If yes, is there a way to obtain

 1/2 Z_{a} X_{b} B^{a b} +  1/2 Z_{a} X_{b} B^{b a} + Z_{a} K^{a}


and

 1/2 \delta{X_{a}} X_{b} B^{a b} +  1/2 \delta{X_{a}} X_{b} B^{b a} + \delta{X_{a}} K^{a}


In case it is really a bug, I run Cadabra 2.2.9 (built on April 7) on macOS High Sierra.

Indeed, my problem is the index name, I thought that that was the job of rename_dummies, maybe I got confused there?
I would like to change the index name to be able to factor out \delta{X_{a}}.