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TempReg

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18 reputation
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location Texas
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visits member for 1 year
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I am studying for a PhD in Math. Phew, math is so tough.
18 reputation
 bio website visits member for 1 year
2 badges
 location Texas seen Jul 7 '12 at 7:12
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3 Questions

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2
 How “many” sub-sequences in a given sequence (cardinality of the set of countably infinite subsets of a countably infinite set)
1
 Quotient map from $\mathbb R^2$ onto $\mathbb R^2\setminus \{(0,0)\}$
0
 Quotient mapping from a triangle onto a cone

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+10 How “many” sub-sequences in a given sequence (cardinality of the set of countably infinite subsets of a countably infinite set)
+5 Quotient map from $\mathbb R^2$ onto $\mathbb R^2\setminus \{(0,0)\}$

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general-topology × 2
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sequences-and-series
0
elementary-set-theory

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Mathematics Stack Exchange Mathematics 18 rep 2

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