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In this paper, we prove the existence of an extremal for the Dunkl-typeSobolev inequality in case of $p=2$. Also we prove the existence of an extremalof the Stein-Weiss inequality for the D-Riesz potential in case of $r=2$.

Existence of an extremal of Dunkl-type Sobolev inequality and of Stein-Weiss inequality for D-Riesz potential