ON YETTER S INVARIANT AND AN EXTENSION OF THEDIJKGRAAF-WITTEN INVARIANT TO CATEGORICAL GROUPS
-
citeseer
(0) (0 Votes)Views: (1011) Date: (13-05-09) Pages: () -
Author: unknown authors
-
Abstract: JO ~AO FARIA MARTINS AND TIMOTHY PORTER Abstract. We give an interpretation of Yetter's Invariant of manifolds M in terms ofthe homotopy type of the function space TOP( M, B(G)), where G is a crossed moduleand B(G) is its classifying space. From this formulation, there follows that Yetter'sinvariant depends only on the homotopy type of M, and the weak homotopy type of thecrossed module G. We use this interpretation to define a twisting of Yetter's Invariant by cohomology classes of crossed modules, defined as cohomology classes of their classifyingspaces, in the form of a state sum invariant. In particular, we obtain an extension of the Dijkgraaf-Witten Invariant of manifolds to categorical groups. The straightforwardexten sion to crossed complexes is also considered.
Related Documents
Related Groups
Related Science News
More on Sciencestage
Answers
- Open Question: Why do I shoot good on my basketball hoop, but bad on others?
Hi, I am a 14 year old boy on my JV basketball team. I have noticed lately that I... - Open Question: How would a purchase on amazon look like on your credit card statement?
Would the payment be under the retailer on amazon, or just under amazon itself? - Undecided Question: How to download videos on the innotab using a mac computer?
...out how to put music and pictures on it but I'm having a lot of trouble... - Resolved Question: What is the French view on sex? How true is the reputation or stereotype of promiscuity?
...when it comes to their views on sex. I'm not French - so please explain to... - Open Question: Can anyone provide tips and insight on being homeless in a large city?
...29 year old female, and will be living on the street alone. I would really appreciate any... - Open Question: What is the funniest comedy currently on television?
...general public find to be the funniest show on the air. When I say funny, I'm ... - Resolved Question: How does increasing the tax percentage on the rich create more jobs?
I heard a liberal on the radio say "increasing the tax percentage on... - Undecided Question: How do I log on to my Inspiron 1545 laptop as I have forgotten the password?
...laptop and my account is the ONLY account on the computer. Do any of you know a way to discard... - Open Question: How do I get my Kindle books to show up on my home screen?
My kindle books will not show up on my home screen, but when I search on my kindle... - Undecided Question: What position should I sight read music on the guitar for Berklee College Of Music audition?
I plan on auditioning for...any suggestions on which position would be best...
News
- On West Coast, Obama courts campaign donors
Courting donors in Democrat-rich California, President Barack Obama devoted all of Thursday to raising millions of dollars for his re-election bid and warning supporters that a long campaign awaits. - Lawmakers Sign Off on Payroll Tax Cut Deal
Negotiators signed off on the bipartisan payroll tax deal this afternoon, paving the way for Congress to approve an extension of the tax credit, unemployment insurance and extend the so-called doc fix for physicians treating Medicare patients. After coming to terms in the midnight hour... - Hands-On With iMessage Beta on the Desktop: A Good Start, With Beta Bugs
iMessage on the desktop went from a wish to (beta) reality in just four months. It's now on the Mac OS X desktop as part of Apple's Mountain Lion update, and our friends at Ars Technica have taken it for a spin. - Euro, shares down on delays in Greek bailout
LONDON (Reuters) - European shares fell and the euro eased to a 3-week low on Thursday as a delay in deciding on a crucial bailout for Greece unnerved investors and halted the rally for riskier assets like equities that has marked the start of 2012. U.S. stock index futures also pointed to a lower open with the warning by ratings agency Moody's of a possible downgrade of several major Wall St ... - Investigation focuses on Houston's behavior, prescriptions
Amid word that Whitney Houston's former husband, Bobby Brown, will attend her weekend funeral, investigators continued Thursday to look into her actions in the days before her death. - On The Fly: Closing Wrap
Stocks on Wall Street were higher as hope for the U.S. housing market and a debt deal for Greece motivated the buyers. The futures moved off their lows following the release of some mostly positive domestic ... - On Day 7 on NY Fashion Week, a new look for layers
Layers are nothing new, but New York Fashion Week is showing them in a different way. - Zynga warning on player spending hits shares
(Reuters) - Zynga Inc's shares fell 16 percent on Wednesday, amid heavy volumes, after the social gaming company warned of a slowdown in bookings, indicating paying players may be spending less than expected. A lackluster fourth-quarter showing -- Zynga's first as a publicly traded company -- and expectations of sequentially slowing bookings in the first half of 2012, may rattle bullish industry ... - Limits sought on electronic driver distractions
The Obama administration wants limits on vehicle features that allow drivers to text and make cellphone calls while the car is moving, the centerpiece of a broader effort to curb distracted driving. Transportation ... - Frankfurt airport set for more disruption on strike
FRANKFURT (Reuters) - Airlines including Deutsche Lufthansa will have to cancel hundreds more flights to and from Frankfurt on Friday as a strike by airfield workers continues at the airport, Europe's third-largest hub. Trade union GdF on Thursday asked about 200 apron controllers who guide planes in and out of parking slots to walk off the job for 14 hours on Friday in addition to a seven-hour ...
Related on Wikipedia