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 Mar18 asked Cycliness of finite subgroup of the multiplicative group of a field Mar17 awarded Notable Question Mar16 comment Why is $(3,1+\sqrt{-5})^2=(2-\sqrt{-5})$ in $\mathbb{Z}[\sqrt{-5}]$ Thanks for the higher viewpoint! Can I ask how you know $P$ is of index 3 in the ring of integers? The only relevant thing I know is the index of a principal ideal in the ring of integers is equal to the norm of the generator over $\mathbb{Q}$. Mar16 asked Tangent space of tangent vector Mar16 accepted Why is $(3,1+\sqrt{-5})^2=(2-\sqrt{-5})$ in $\mathbb{Z}[\sqrt{-5}]$ Mar15 asked Why is $(3,1+\sqrt{-5})^2=(2-\sqrt{-5})$ in $\mathbb{Z}[\sqrt{-5}]$ Mar14 comment Concrete example of zero section Could you say something about my question on zero vector in tangent space? Mar14 asked Concrete example of zero section Mar14 accepted A “wrong” counterexample to splitting lemma in linear algebra Mar13 comment On the definition of critical point But can I ask why such a definition is counter-intuitive considering the circle example I give in the question? Why is defining critical point this way beneficial in that case? Mar13 comment Definition of critical point Could you take a look at my new question on critical point--math.stackexchange.com/questions/1188815/… Mar13 comment On the definition of critical point @RobinGoodfellow Yes, I'm sure. Mar13 revised On the definition of critical point added 123 characters in body Mar13 revised On the definition of critical point added 16 characters in body Mar13 asked On the definition of critical point Mar13 accepted Definition of critical point Mar13 comment A “wrong” counterexample to splitting lemma in linear algebra @hunter I now understand I gave a wrong counterexample to a wrong statement... Now I just wonder if someone could give me a good reference on this (a nice treatment of this in a linear algebra book). Mar13 comment A “wrong” counterexample to splitting lemma in linear algebra I feel even more confused after reading all the comments and answers... Mar13 asked A “wrong” counterexample to splitting lemma in linear algebra Mar13 comment Definition of critical point Can I ask what $v$ means in your formula $df_p(v)=f′(p)v$?