consider(ℝ,τ), where τ={∅}∪{u⊆ℝ:{-π,π}⊆u}.

Is [-4.4] open in (ℝ,τ) ? Justify your answer

Is (-3,3) closed in (ℝ,τ) ? Justify your answer

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- May 26th 2010, 09:25 PMblblopen and closed
**consider****(ℝ,τ)****, where τ={∅}∪{u⊆ℝ:{-π,π}⊆u}.**

Is [-4.4] open in (ℝ,τ) ? Justify your answer

Is (-3,3) closed in (ℝ,τ) ? Justify your answer - May 26th 2010, 09:26 PMDrexel28