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S May 31, 2022 at 9:55 history suggested Sergey Guminov CC BY-SA 4.0
Corrected spelling and grammar, all changes approved by the author of the question.
May 31, 2022 at 9:54 review Suggested edits
S May 31, 2022 at 9:55
May 31, 2022 at 8:58 comment added user44143 Please don’t make edits for single spelling mistakes, especially when there are other similarly obvious errors still to be corrected.
May 31, 2022 at 8:28 history edited Donich CC BY-SA 4.0
added 1 character in body
May 30, 2022 at 20:16 history edited Donich CC BY-SA 4.0
deleted 1 character in body
May 30, 2022 at 19:42 history became hot network question
May 30, 2022 at 15:42 review Close votes
Jun 4, 2022 at 3:09
May 30, 2022 at 15:08 history edited Donich CC BY-SA 4.0
edited body
May 30, 2022 at 13:39 vote accept Donich
May 30, 2022 at 13:11 answer added Robert Bryant timeline score: 25
May 30, 2022 at 12:52 comment added Willie Wong What if $L(x,y) = x^2 - y^2$? What is the normal vector at the origin? No matter what you choose as $n(0,0)$, the set $L_\delta$ is not closed in $\mathbb{R}^2$.
May 30, 2022 at 12:16 history edited Donich CC BY-SA 4.0
added 14 characters in body
S May 30, 2022 at 11:38 review First questions
May 30, 2022 at 12:21
S May 30, 2022 at 11:38 history asked Donich CC BY-SA 4.0