Let f, g: R → R be continuous at a point c, and let h(x) = sup{f(x), g(x)} for x € R. Show that h(x) = (f(x) + g(x)) + ½ |ƒf(x) − g(x) for all x € R. Use this to show that h is continuous at c.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Let \( f, g : \mathbb{R} \to \mathbb{R} \) be continuous at a point \( c \), and let \( h(x) := \sup \{ f(x), g(x) \} \) for \( x \in \mathbb{R} \). Show that 

\[ h(x) = \frac{1}{2}(f(x) + g(x)) + \frac{1}{2}|f(x) - g(x)| \]

for all \( x \in \mathbb{R} \). Use this to show that \( h \) is continuous at \( c \).
Transcribed Image Text:Let \( f, g : \mathbb{R} \to \mathbb{R} \) be continuous at a point \( c \), and let \( h(x) := \sup \{ f(x), g(x) \} \) for \( x \in \mathbb{R} \). Show that \[ h(x) = \frac{1}{2}(f(x) + g(x)) + \frac{1}{2}|f(x) - g(x)| \] for all \( x \in \mathbb{R} \). Use this to show that \( h \) is continuous at \( c \).
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