bio | website | preschema.com |
---|---|---|
location | Essen, Germany | |
age | 23 | |
visits | member for | 4 years, 9 months |
seen | 6 hours ago | |
stats | profile views | 1,050 |
Jul 30 |
awarded | Critic |
Jul 27 |
answered | Geometric flavored textbook on algebra |
Jul 27 |
accepted | Projective transformation between polygons. |
Jul 26 |
asked | Projective transformation between polygons. |
Jul 25 |
accepted | Linear transformation takes a polygon to another one. |
Jul 25 |
comment |
eBook readers for mathematics
PDF panning and zooming was actually just added to the Kindle yesterday. (It's a software update so you can just download it.) |
Jul 25 |
answered | Marey's problem: Generating all prime numbers in $[n_1,n_2]$ |
Jul 25 |
comment |
Experimental Mathematics
Schwartz and Tabachnikov found a few sets of interesting elementary theorems in projective geometry by computer experiment: math.brown.edu/~res/Papers/intelligencer4.pdf. |
Jul 25 |
asked | Linear transformation takes a polygon to another one. |
Jul 20 |
accepted | Examples of computing Ext and Tor functors? |
May 25 |
awarded | Teacher |
May 25 |
answered | Undergraduate Level Math Books |
May 19 |
awarded | Autobiographer |
May 19 |
comment |
Examples of computing Ext and Tor functors?
@Jack Schmidt: Thanks! Exactly what I was looking for. @Martin Brandenburg: I have consulted several. Do you know of one that goes through an example like this? |
May 17 |
awarded | Scholar |
May 17 |
asked | Examples of computing Ext and Tor functors? |
May 17 |
accepted | Coinciding induced maps |
May 17 |
comment |
Coinciding induced maps
Sorry, I mean complexes $0 \to I_0 \to I_1 \to \cdots$ with $I_i$ injective or $\cdots \to P_1 \to P_0 \to 0$ with $P_i$ projective. Because then you can construct homotopy maps inductively. |
May 17 |
awarded | Supporter |
May 17 |
comment |
Coinciding induced maps
Yes, of course it's not true in general — I asked "when" is it true. I feel it should be true when both complexes consist of either all projective or all injective modules, and are bounded. In the unbounded case it seems false. |