In preparation for a qualifying exam in Real Analysis, during the summer of 2013, I plan to solve as many problems from Stein & Shakarchi's Real Analysis text as I can. Please feel free to comment or correct me as I make my way through this.
Tuesday, July 2, 2013
3.2
Recall the statement from exercise 3.1c, however, instead of:
\int_\mathbb{R}^d K_\delta (y) = 1
Write: (\dagger) For some particular C \in \mathbb{R}:
\int_\mathbb{R}^d K_\delta (y) = C
The new statement should read:
\dagger \hspace{0.25cm} \Rightarrow (f*K_\delta)(x) \to Cf(x) \hspace{0.25cm} \text{as} \hspace{0.25cm} \delta \to 0
The argument follows identically to how the C=1 case is shown for approximations to the identity. Now, simply consider C = 0, and we're done.
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