# Talk:Fejér kernel

Could someon clarify: what norm are used for ${\displaystyle \|F_{n}*f\|_{L^{p}([-\pi ,\pi ])}\leq \|f\|_{L^{p}([-\pi ,\pi ])}}$ when ${\displaystyle f\in {\mathbf {C} }}$ Vorval 0 (talk) 11:35, 29 September 2011 (UTC)
I think what is meant is ${\displaystyle f\in \mathbf {C} \cap L^{p}([-\pi ,\pi ]).}$ — Preceding unsigned comment added by 129.2.129.30 (talk) 06:14, 30 November 2011 (UTC)