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42
The preimage of continuous function on a closed set is closed.
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36
Finite union of compact sets is compact
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28
Prove that the additive inverse of an odd integer is an odd integer
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14
Limit point and interior point
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12
Prove that this is no real number such that $x \leq a$ for all real $x$.
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11
“$f$ is a function from $A$ to $B$” vs. “$f $is a function from $A$ into $B$”?
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11
Application of Liouville's Theorem
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9
Rudin Theorem 3.27
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9
A subgroup containing a kernel of a group homomorphism into an abelian group is a normal subgroup.
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8
Center of a group of order 77
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8
Complete undergraduate bundle-pack
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8
Need help understanding Erdős' proof about divergence of $\sum\frac1p$
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7
Interval iff image is interval
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7
What is the difference between vector components and its coordinates?
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7
(Simple) Examples on Non-Commutative Rings
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7
$A$ is a subset of $B$ if and only if $P(A) \subset P(B)$
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6
Is this claim true that $g\circ h$ is bijection?
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6
Find a metric space X and a subset K of X which is closed and bounded but not compact.
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6
What is the best introduction to Chomskyan linguistics?
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5
A question on open mappings
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5
How to Prove the Dimension of the Annihilator
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5
Can an "opinion" be right or wrong?
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