Is there a name for a (topological) space which is the countable union of compact sets.
For example $\mathbb{R}^N = \bigcup_{j\in\mathbb{N}} j \,B_{\mathbb{R^N}}$.
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2$\sigma$-compact. – Daniel Fischer May 13 '15 at 17:26
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1Thanks! Should I delte this question again, because it seems kind of trivial? – Peter May 13 '15 at 17:28