bio  website  maths.swan.ac.uk/staff/ejb 

location  Swansea, Wales  
age  
visits  member for  2 years, 4 months 
seen  5 hours ago  
stats  profile views  141 
1d

awarded  Yearling 
1d

revised 
Identifying a Hopf algebra cohomology theory
spelling! 
2d

asked  Identifying a Hopf algebra cohomology theory 
Mar 5 
comment 
How rigid can a rigid object be in GR?
That is a good way of thinking about it  and may well give a method for finding the answer. 
Mar 4 
comment 
How rigid can a rigid object be in GR?
The problem is, what if we cannot start in flat space? What is the best that we can do with the coordinate system? The black hole is just an example of a localised curvature  the details are not important. 
Mar 4 
comment 
How rigid can a rigid object be in GR?
There is a coordinate system which is formed by taking a 3D space like submanifold, and declaring it to be time zero, and then taking the geodesic motion in 4D perpendicular to the submanifold, with time coordinate proper time. This gives a nicely behaved coordinate system, at least locally. If we can start in flat space, and then move into more complicated geometry, we can set an initial metric on the 3D slice to be the usual Euclidian metric. 
Mar 4 
comment 
How rigid can a rigid object be in GR?
The question is a bit ambiguous, but I was hoping that there was an existing body of literature, and I did not want to make it too restrictive. 
Mar 3 
asked  How rigid can a rigid object be in GR? 
Nov 3 
asked  model structure of noncommutative nonnegatively graded DGAs 
Oct 24 
revised 
Second order term of the Fedosov quantised product
added tag 
Oct 23 
asked  Second order term of the Fedosov quantised product 
Jul 24 
awarded  Tumbleweed 
Jul 17 
asked  the push forward of the differential idea of sheaf 
Jul 4 
awarded  Yearling 
Jul 4 
asked  allowing `discontinuous functions' into a C* algebra 
Jul 2 
awarded  Curious 
Jun 26 
comment 
complementary bundle for a divisor
More thought  the direct sum by preference, if not then any related construction would be welcome. 
Jun 26 
comment 
complementary bundle for a divisor
Honestly, I do not know which. Whichever works nicely I guess. I had thought of the first, but anything nice to say about the second would be welcome. Modules with connection in noncommutative geometry form an abelian category, so either approach could be used in noncommutative geometry. 
Jun 26 
asked  complementary bundle for a divisor 
Jun 10 
comment 
When is the corner algebra $PM_n(A)P$ isomorphic to $A$?
Just got a copy of Brown's paper  I will read it! 