I found the following interesting identity which is similar to what I have showed recent days [here]. In that entry, we showed that
where and are connected by
.
For we denote by the following
.
Then we show that
Lemma..
Proof. Writing
we have
.
Similarly, writing
we have
.
By
it follows that
.
Then we obtain
.
By the property of the Kelvin transformation, we obtain
.
Then we have
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