User dan - MathOverflow

dan

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Member for 13 years, 8 months

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12 Questions

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8 votes

2 answers

644 views

does this group have a name?

asked Dec 3, 2010 at 0:12

7 votes

2 answers

812 views

need a good reference for introduction to elementary theory of groups

asked Feb 14, 2011 at 19:23

6 votes

2 answers

815 views

showing the subgroup membership problem is undecidable for $F_2 \times F_2$

asked Feb 4, 2011 at 17:24

6 votes

2 answers

442 views

need references regarding the elementary theory of free semigroup and free abelian groups

asked Feb 12, 2011 at 23:35

5 votes

1 answer

649 views

an example of a semigroup with solvable word problem but unsolvable power problem

asked Apr 11, 2011 at 18:12

5 votes

3 answers

665 views

examples of finitely generated semigroups that are not residually finite

asked Dec 7, 2010 at 21:49

5 votes

1 answer

373 views

Realizing Baumslag-Solitar groups as functions of the $n$-adic integers

asked Jan 15, 2011 at 4:26

2 votes

2 answers

2k views

post correspondence problem

asked Aug 12, 2010 at 22:14

2 votes

2 answers

297 views

what conditions can one place on a finitely generated periodic semigroup that will ensure the semigroup is finite?

asked Aug 28, 2010 at 19:32

2 votes

0 answers

347 views

quotients of triangle groups

asked Mar 4, 2011 at 2:21

1 vote

1 answer

331 views

Does the group $\langle a,b,c \mathbin | a^2b^2c^2=1\rangle $ have $\mathbb{Z} \times F_2$ as a subgroup?

asked Feb 11, 2011 at 19:06

1 vote

1 answer

149 views

undecidability in the dynamics of functions $f: \Sigma^* \rightarrow \Sigma^*$

asked Feb 25, 2011 at 18:27