Thread Tools Display Modes
Old 01-05-2010, 01:10 PM
Join Date: May 2000
Location: Brooklyn
Posts: 23,410
Integral sign with a circle on it

What does it mean? It looks like a normal integral sign, with an open circle super-imposed in the middle of the squiggle.
Old 01-05-2010, 01:16 PM
Join Date: Feb 2007
Location: Challenger Deep
Posts: 10,331
Integral over a closed path.

Last edited by Machine Elf; 01-05-2010 at 01:17 PM.
Old 01-05-2010, 03:09 PM
Mod Rocker
Join Date: Mar 1999
Location: N E Ohio
Posts: 40,382
Also known as a Contour Integral.

Last edited by tomndebb; 01-05-2010 at 03:10 PM.
Old 01-05-2010, 03:15 PM
Charter Member
Join Date: Dec 2002
Location: Very east of Foggybog, WI
Posts: 4,434
Originally Posted by tomndebb View Post
Also known as a Contour Integral.
A contour integral can be over any contour not necessarily a closed path (which starts and ends at the same spot. So all integrals over closed paths are contour integrals (as are all normal real line integrals whose path is just some portion of the real line), but not all contour integrals are integrals over closed paths. The symbol the OP asked about is usually just for closed paths.

BTW a double integral with a superimposed circle (or often oval) is an integral over a closed surface. e.g., an integral of a function over an entire sphere.

Last edited by OldGuy; 01-05-2010 at 03:16 PM.
Old 01-05-2010, 03:34 PM
Join Date: Jun 2006
Posts: 16,578

Those things can "take you to the limit" coming and going
Old 01-05-2010, 03:42 PM
Join Date: Oct 2000
Location: Yes
Posts: 20,327
What does it mean?

It mean's you're taking second semester engineering physics, Maxwell's equations, and your Calculus class isn't keeping up.
Old 01-05-2010, 03:45 PM
Charter Member
Join Date: Jul 2000
Location: The land of the mouse
Posts: 43,491
But relax, you won't need it ever again after you take the final.
Old 01-05-2010, 06:53 PM
Join Date: Dec 2002
Location: South Bay
Posts: 80,477
Originally Posted by ElvisL1ves View Post
But relax, you won't need it ever again after you take the final.
Yep. I took all sorts of high level math classes in college, worked in a highly technical field in Silicon Valley, and I think the most difficult calculation I ever had to do on the job was to take an average.

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Forum Jump

All times are GMT -5. The time now is 08:07 AM.

Copyright © 2017
Best Topics: roof lichens snorg tees ashley tracing electrical wire scandinavian cheekbones homeless friendly cities xm radio commercials gorilla human sex code symbol looney tunes classical define camping symbicort commercial cat squint keller rope tie arlo guthrie republican thomas edison mexican corian refinishing knife finger game cockroach natural predator zipcar credit check horsehair upholstery tips for cashiers define nigardly salty sayings ups sump pump autopsy house dominos square cut luminous hands chicago o'hare abbreviation reducing alcohol tolerance puke powder prepubescent sex manufacturer abbreviation is a traffic violation a criminal offense sentence with all alphabet how much space between cars rod stewart find a reason to believe can i pepper spray a dog john wayne and james caan director vs manager vs coordinator how many watts to kill a human what kind of alien is yoda paver vs concrete patio driver ed cars for sale first communion gift from godparents jazz song from lincoln commercial how do i stop others from seeing my comments on facebook what did the romans look like can asbestos kill you what is the difference between a drone and an rc plane like a monkey fucking a football map of gilligan's island what happens to all the food cooked on qvc black gunk in faucet aerator i take my coffee black how to make money in the cattle business have you ever seen a grown man airplane wenger vs victorinox swiss army knives chances of survival of patient on ventilator how to solidify poop bin to iso daemon tools jury duty but i moved steely dan josie lyrics french bulldog c section