Yong Pan

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217 reputation
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age 32
visits member for 1 year, 3 months
seen Mar 21 at 6:54
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I like to try math in my spare time.


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Feb
15
 awarded  Yearling
Feb
7
 accepted Product of monic irreducibles with degree dividing $n$ has no repeated roots?
Jan
25
 asked Product of monic irreducibles with degree dividing $n$ has no repeated roots?
Sep
28
 accepted Is $[0,1)\times[0,1]$ a linear continuum?
Sep
22
 revised Is $[0,1)\times[0,1]$ a linear continuum?
added 22 characters in body
Sep
22
 asked Is $[0,1)\times[0,1]$ a linear continuum?
Jul
6
 asked Question on Malcev's _Immersion of an Algebraic ring into a skew field_.
Jul
3
 accepted Why is the absence of zero divisors not sufficient for a field of fractions to exist?
Jul
3
 comment Why is the absence of zero divisors not sufficient for a field of fractions to exist?
Thanks for the reference, it's quite illuminating for me.
Jul
3
 comment Why is the absence of zero divisors not sufficient for a field of fractions to exist?
Thanks Martin, the link was quite helpful. I've used your advice on finding papers a handful of times already since you've posted these comments!
Jul
2
 awarded  Nice Question
Jul
1
 asked Why is the absence of zero divisors not sufficient for a field of fractions to exist?
Jun
10
 accepted Is there an easy formula for $\operatorname{Tor}_i^{\mathbb{Z}/(p^n)}(\mathbb{Z}/(p),\mathbb{Z}/(p))$?
Jun
10
 accepted Is there a general formula for $\operatorname{Ext}_{\mathbb{Z}/(p^n)}^i(\mathbb{Z}/(p),\mathbb{Z}/(p))$?
May
1
 asked Is there an easy formula for $\operatorname{Tor}_i^{\mathbb{Z}/(p^n)}(\mathbb{Z}/(p),\mathbb{Z}/(p))$?
Apr
30
 awarded  Commentator
Apr
30
 comment Is there a general formula for $\operatorname{Ext}_{\mathbb{Z}/(p^n)}^i(\mathbb{Z}/(p),\mathbb{Z}/(p))$?
Sorry, I don't know why my comment isn't rendering properly.
Apr
30
 comment Is there a general formula for $\operatorname{Ext}_{\mathbb{Z}/(p^n)}^i(\mathbb{Z}/(p),\mathbb{Z}/(p))$?
Thank you Martin. So to summarize, and please correct me if I misunderstood you, $$\operatorname{Ext}_{\mathbb{Z}/(p^n)}^i(\mathbb{Z}/(p^n),\mathbb{Z}/(p^n))\con‌​g \{0\}$$ for all $i\geq 0$ if $n=1$, but $$\operatorname{Ext}_{\mathbb{Z}/(p^n)}^i(\mathbb{Z}/(p^n),\mathbb{Z}/(p^n))\con‌​g \mathbb{Z}/(p)$$ for all $i\geq 0$ if $n>1$?
Apr
30
 comment Is there a general formula for $\operatorname{Ext}_{\mathbb{Z}/(p^n)}^i(\mathbb{Z}/(p),\mathbb{Z}/(p))$?
@Norbert Sure! I found them here, at Algebra Seminar, UWaterloo, Spring 2010. The formula in question is a few slides from the end.
Apr
30
 asked Is there a general formula for $\operatorname{Ext}_{\mathbb{Z}/(p^n)}^i(\mathbb{Z}/(p),\mathbb{Z}/(p))$?
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