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Jun
29
revised A $X \subseteq \mathbb{A}^n$ such that $I(X) \neq I(V(I(X)))$?
added 272 characters in body; edited title
Jun
28
comment A $X \subseteq \mathbb{A}^n$ such that $I(X) \neq I(V(I(X)))$?
@Surb My friend said that in the context of algebraic geometry, anyone who had studied it would understand.
Jun
28
comment A $X \subseteq \mathbb{A}^n$ such that $I(X) \neq I(V(I(X)))$?
@Surb Notice that the level of this question is far beyond my usual questions. The answer provider even spoke about Hilbert's Nutella. Must be very profound indeed.
Jun
28
comment A $X \subseteq \mathbb{A}^n$ such that $I(X) \neq I(V(I(X)))$?
@Surb This is a question a friend of mine asked me to do: He's a PhD student in a nearby mathematics university but as he had no internet at the moment, he asked me to ask this for him via SMS, as I explained in the comment to the user who provided an answer. My friend told me that no additional motivation was needed and that he had a personal style of asking dry questions.
Jun
28
comment A $X \subseteq \mathbb{A}^n$ such that $I(X) \neq I(V(I(X)))$?
I asked this for a friend: He was having trouble with his internet connection and sent me the question via SMS. As you may have noticed, this is far beyond the level of my habitual questions. He said that your answer is satisfactory and told me to accept it.
Jun
28
accepted A $X \subseteq \mathbb{A}^n$ such that $I(X) \neq I(V(I(X)))$?
Jun
28
asked A $X \subseteq \mathbb{A}^n$ such that $I(X) \neq I(V(I(X)))$?
Jun
28
asked Why $\int_c^{x+h}f(t) dt-\int_c^x f(t) dt = A(x+h)-A(x)$?
Jun
26
comment e and its applications
@user250837 See Courant/John's: Introduction to Calculus and Analysis. Chapter 3, Section 4.
Jun
25
revised If $k$ is a non-zero constant, determine by inspection the indefinite integral of $\int e^{kx} dx$.
added 200 characters in body
Jun
25
asked If $k$ is a non-zero constant, determine by inspection the indefinite integral of $\int e^{kx} dx$.
Jun
23
revised Why $\|X-F\|=e|(X-F)\cdot N -d|$ should be written as $\|X-F\|=e|(X-F)\cdot N +d|$?
added 433 characters in body
Jun
23
revised Why $\|X-F\|=e|(X-F)\cdot N -d|$ should be written as $\|X-F\|=e|(X-F)\cdot N +d|$?
added 106 characters in body
Jun
23
asked Why $\|X-F\|=e|(X-F)\cdot N -d|$ should be written as $\|X-F\|=e|(X-F)\cdot N +d|$?
Jun
21
comment Looking for Advice Self Study Analysis
There is no best book. Just get some books and try what you think is best. I recommend as a parallel reading: Wanner/Hairer's: Analysis by Its History.
Jun
21
comment Find the equations of the lines tangent to the circle $x^2+y^2=r^2$ that pass through the point $(a,0)$?
@Macavity Now, why the roots do give the points of intersection of the curves? I'm a little lost at explaining this.
Jun
21
comment Find the equations of the lines tangent to the circle $x^2+y^2=r^2$ that pass through the point $(a,0)$?
@Macavity Yes. I understood that from the context of the book, but he's speaking about roots, and then it seems that he computes only the discriminant, instead of computing the roots using the quadratic formula.
Jun
21
asked Find the equations of the lines tangent to the circle $x^2+y^2=r^2$ that pass through the point $(a,0)$?
Jun
20
asked Why $\int_a^b f(x) dx=\int_0^\infty g(t) dt \text{ with } t=\frac{x-a}{b-x}$?
Jun
20
comment Example of binary GCD for complex integers?
Yes. It is possible, it's possible to a lot of kinds of integers (Eisenstein, etc). Read Stillwell's: Elements of Number Theory. But I'm not sure what you mean with "this idea".