Timeline for Detecting if a polynomial is a Pfaffian
Current License: CC BY-SA 3.0
13 events
| when toggle format | what | by | license | comment | |
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| May 16, 2016 at 9:03 | vote | accept | IMeasy | ||
| Apr 19, 2016 at 16:09 | comment | added | Ben McKay | The Pfaffian of a skew symmetric matrix is a polynomial in the entries of the matrix, whose square is the determinant of the matrix, as given in your explicit formula. But the Pfaffian of a real matrix can be positive or negative, so the Pfaffian is not the square root, but only one of the two square roots, of the determinant. | |
| S Apr 19, 2016 at 16:04 | history | suggested | Amir Sagiv | CC BY-SA 3.0 |
edited the tags. added pfaffian tag. commutative algebra and algebraic geometry are too loosely related
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| Apr 19, 2016 at 15:32 | review | Suggested edits | |||
| S Apr 19, 2016 at 16:04 | |||||
| Jun 26, 2011 at 19:14 | answer | added | Hailong Dao | timeline score: 5 | |
| Jun 26, 2011 at 17:43 | comment | added | IMeasy | I am sorry for the sloppyness of the question. I assumed, without stating, that the matrix had linear entries. Now I've edited it. | |
| Jun 26, 2011 at 17:42 | history | edited | IMeasy | CC BY-SA 3.0 |
added 32 characters in body
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| Jun 26, 2011 at 15:51 | comment | added | roy smith | As motivation for related questions, Mumford gives, in his first paper on Prym varieties, an explicit Pfaffian of linear forms, which defines the tangent cone to the theta divisor of a Prym variety precisely when that Pfaffian is not identically zero. When this occurs is more complicated however and was only settled some 25 years later. | |
| Jun 26, 2011 at 3:48 | comment | added | Gjergji Zaimi | Please try to improve the question! As it stands, it might (and probably should) get closed for lack of clarity, motivation etc. | |
| Jun 25, 2011 at 20:47 | answer | added | Francesco Polizzi | timeline score: 18 | |
| Jun 25, 2011 at 17:26 | comment | added | Qiaochu Yuan | What is a Pfaffian polynomial? | |
| Jun 25, 2011 at 17:06 | answer | added | Bruce Westbury | timeline score: 13 | |
| Jun 25, 2011 at 16:41 | history | asked | IMeasy | CC BY-SA 3.0 |