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How to look up a math symbol?
A symbol for the field of formal Laurent series

enter image description here

Could anyone tell me how to print the left bracket in these 2 formulae? And their corresponding right one (not ')').

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marked as duplicate by Jake, Caramdir, Alan Munn, Werner, Loop Space Aug 17 '11 at 8:00

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Please crop your image to an acceptable size. –  Caramdir Aug 17 '11 at 3:52
Give Detexify a go: Just draw the symbol there, and look at the suggested symbols. I think it's \llparenthesis from the stmaryrd package. –  Jake Aug 17 '11 at 3:53
I don't think this should be downvoted. The question itself is fine and relevant to other people. Just because it might be a duplicate, that doesn't mean it's a bad question. Plus, it includes an image, which is much better than just describing the character. –  Jake Aug 17 '11 at 4:40
@Jake: I downvoted because of how careless the question was done with that huge image. The question is still far from ideal, but better now. –  Caramdir Aug 17 '11 at 5:38
@Herbert: I'd say that questions that show that the OP hasn't done any work himself are the only reasons to downvote (off-topic/duplicate/non-constructive should simply be closed). I'm slowly coming to the conclusion that some downvoting might be helpful to show users not to abuse the system and let other people do all the work for them. (But this discussion should be done on Meta, and not in comments to some random question.) –  Caramdir Aug 17 '11 at 17:07

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