Let $$n\in \mathbb {N}$$n∈N, $$n\ge 2$$n≥2, $$\beta >0$$β>0 fixed, and $$0 Click to show full abstract
Let $$n\in \mathbb {N}$$n∈N, $$n\ge 2$$n≥2, $$\beta >0$$β>0 fixed, and $$0
               
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