Mathematics
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pyridoxal_trigeminus
  • Member for 1 year, 3 months
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74
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37
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8
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Top posts
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All Questions Answers
Score Newest
question
8
Prove that $\mathbb{Z} \times\Bbb Z_2$ and $\mathbb{Z}$ are not isomorphic.
Jan 31
question
6
Is there a such thing as a free group generated by a free group?
Mar 19
question
5
Are there any topological spaces containing no proper retracts? i.e. $A\subset X$ s.t. $\exists r:X\to A$ continuous w/ $r(a)=a,\forall a\in A$
Aug 3
question
4
Are the positive irrational numbers closed under addition?
Aug 11
question
4
If you sum all possible subsets of peoples' birthday dates in a group of 7 people, will two sets always have the same sum?
Oct 30, 2021
question
4
Prove that for any $x \in \mathbb{R}$, $x = \sup \{q \in \mathbb{Q} : q < x\}$
Oct 10, 2021
question
3
Continuous Bijection which is Not a Homeomorphism
Oct 9, 2021
question
3
Prove $S_4$ has no normal subgroup of order 8, or of order 3?
Feb 18
question
3
Can the direct product of nontrivial groups $A\times B$ ever be isomorphic to a free group?
Mar 19
question
3
What is the kernel of this map $\Phi: F_2 \to \mathbb{Z}_2 \oplus \mathbb{Z}_3$?
Feb 21
Top network posts
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10
Is there a name for this vintage 3-pin connector configuration?
9
How do you know when a textbook is too difficult for you?
5
How to make edges "tuck behind" each other in TiKz?
5
What is the name for this connector socket pin configuration?

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