464 reputation
39
bio website tqft.net
location Berkeley, CA
age 35
visits member for 2 years, 11 months
seen Dec 4 at 3:48

Mathematician at the Australian National University. Moderator on mathoverflow.net.


Dec
3
comment Factoring an ideal in a number field into prime ideals
Thanks -- I guess I should have given a harder example. :-)
Dec
2
revised Factoring an ideal in a number field into prime ideals
linking to sage documentation
Dec
2
asked Factoring an ideal in a number field into prime ideals
Dec
2
comment How is pattern specificity decided?
I think we're talking at cross purposes. I'm not interested, here, in the multiple ways that a single pattern can match a single expression, but rather the rule that Mathematica uses to linearly order the rules in the DownValues of a symbol.
Dec
1
comment How is pattern specificity decided?
When you say "it is unclear to me that this is always true", what exactly do you mean might not be true? That _?f and _?g are always considered incomparable? If so, what values of f and g could results in these being comparable?
Dec
1
comment How is pattern specificity decided?
Hi @Stuart, thanks for your answer, but I'm confused by many of the things you say. Could you explain what you mean by the terms "injective" and "surjective" above? What function are you considering, exactly?
Dec
1
comment Error in NullSpace, with AlgebraicNumber entries
I can confirm that this bug is fixed in v. 10.
Dec
1
awarded  Curious
Nov
30
comment Error in NullSpace, with AlgebraicNumber entries
Time to upgrade, I guess. Lame.
Nov
30
awarded  Commentator
Nov
30
comment Error in NullSpace, with AlgebraicNumber entries
I certainly agree the matrix is full rank. It's mathematica which seems to be having difficulty. :-) Which version are you running on? On 9.0.1.0, I'm definitely seeing rank 12 here.
Nov
30
comment Error in NullSpace, with AlgebraicNumber entries
@bills; oops, I've corrected my claims, now! My original example had been block diagonal, and I cut it down to the relevant block, but forgot to update my post.
Nov
30
revised Error in NullSpace, with AlgebraicNumber entries
oops, correcting size
Nov
30
comment Error in NullSpace, with AlgebraicNumber entries
I'd also be curious to hear if other versions experience this problem.
Nov
30
asked Error in NullSpace, with AlgebraicNumber entries
Sep
24
comment J/Link doesn't work with Java 8?
@Ymareth, this is on OS X. When using Java 7 it successfully finds the library based on its relative path from JLink.jar. Under Java 8 apparently not.
Sep
24
awarded  Yearling
Sep
24
asked J/Link doesn't work with Java 8?
Dec
31
awarded  Good Question
Aug
8
asked What range of ports do remote kernels use?