4. Let E=]0,4[U]5, 6[ . (a) Prove that xo (b) Decide whether E is open, closed or compact, and determine the 3 is an interior point of E. • set E° of the interior points of E, • set ƏE of the boundary points of E , • set E' of the limit points of E and • the closure E of E.

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ISBN:9780470458365
Author:Erwin Kreyszig
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4. Let E=]0,4[U]5, 6[ .
(a) Prove that xo
(b) Decide whether E is open, closed or compact, and determine the
3 is an interior point of E.
• set E° of the interior points of E,
• set dE of the boundary points of E,
• set E' of the limit points of E and
• the closure E of E.
Transcribed Image Text:4. Let E=]0,4[U]5, 6[ . (a) Prove that xo (b) Decide whether E is open, closed or compact, and determine the 3 is an interior point of E. • set E° of the interior points of E, • set dE of the boundary points of E, • set E' of the limit points of E and • the closure E of E.
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