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Sep
15
comment Cross Ratio is positive real if four points on a circle
If you actually meant that the number is positive, then well, that is not true.
Sep
15
answered Cross Ratio is positive real if four points on a circle
Sep
15
comment Consider the equation $x^4-5x^3+2x^2-5x+1=0$
It is not «positive or negative $i$»: that simply makes no sense. What you mean is $i$ or $-i$.
Sep
15
comment degree of morphism of schemes
The most shocking example of your remark, for me, is the way algebraic geometers have generalized the meaning of "local" so as to trivialize things. It is a great accomplishment :-)
Sep
15
comment Is an elementry abelian group a non-degenerate symplectic vector space?
That is not a bilinear form.
Sep
13
revised Curve in union of hyperplanes
added 116 characters in body
Sep
13
comment Curve in union of hyperplanes
Well, your deleted comment, which you added when I asked for clarification, clarified the question into something else! :-)
Sep
13
answered Curve in union of hyperplanes
Sep
13
comment Curve in union of hyperplanes
Please edit the question so that it asks the actual question you wanted to ask.
Sep
13
comment Curve in union of hyperplanes
Ok. This does not answer the question as amended by on of the comments...
Sep
13
answered Curve in union of hyperplanes
Sep
13
comment Curve in union of hyperplanes
Then no. ${}{}{}$
Sep
13
comment End(V) and End(V)xEnd(V) are isomorphic
If you take a little time searching for older questions,you will find it.
Sep
13
answered End(V) and End(V)xEnd(V) are isomorphic
Sep
13
comment Curve in union of hyperplanes
You want to find, for any point in the domain, such an interval containing it in its interior?
Sep
12
awarded  Nice Question
Sep
12
comment Idempotents in quotient ring
Can you describe the idempotents in a ring of the form $R\times S$, assuming you know the idempotents of $R$ and of $S$?
Sep
12
comment Questions about the bracket
I have to say that I don't understand any of your questions.
Sep
10
comment What's the terminology for whether a number is positive or negative?
"sign"? ${}{}{}{}{}$
Sep
10
awarded  Nice Answer