1. Suppose f is continuous on R and f satisfies f(x) + f(2x) = 0 for all x E R. Prove that f = 0 on R.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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**Continuity and Sequences in Real Analysis**

**Problem 1:**

Suppose \( f \) is continuous on \( \mathbb{R} \) and \( f \) satisfies

\[ f(x) + f(2x) = 0 \]

for all \( x \in \mathbb{R} \). Prove that \( f = 0 \) on \( \mathbb{R} \).

**Problem 2:**

Suppose \( f \) is continuous on \([a, b]\) and there exists a sequence \(\{x_n\}\) in \([a, b]\) such that

\[ 0 \leq f(x_n) \leq \frac{1}{n} \]

for all \( n \in \mathbb{N} \). Prove that \( f(x_0) = 0 \) for some \( x_0 \in [a, b] \).
Transcribed Image Text:**Continuity and Sequences in Real Analysis** **Problem 1:** Suppose \( f \) is continuous on \( \mathbb{R} \) and \( f \) satisfies \[ f(x) + f(2x) = 0 \] for all \( x \in \mathbb{R} \). Prove that \( f = 0 \) on \( \mathbb{R} \). **Problem 2:** Suppose \( f \) is continuous on \([a, b]\) and there exists a sequence \(\{x_n\}\) in \([a, b]\) such that \[ 0 \leq f(x_n) \leq \frac{1}{n} \] for all \( n \in \mathbb{N} \). Prove that \( f(x_0) = 0 \) for some \( x_0 \in [a, b] \).
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