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Jun
21
awarded  Notable Question
Jan
20
awarded  Popular Question
Jan
4
accepted Is $C^1[a,b]$ a Banach space as a subspace of $C[a,b]$?
Dec
22
asked Is $C^1[a,b]$ a Banach space as a subspace of $C[a,b]$?
Oct
28
awarded  Yearling
Sep
13
awarded  Popular Question
Aug
5
awarded  Popular Question
Jul
2
awarded  Curious
Jul
2
awarded  Inquisitive
Jun
6
comment Why are function fields of $U\subset V$ are equal?
@ZhenLin, could you give me a proof or a reference?
Jun
5
asked Why are function fields of $U\subset V$ are equal?
Jun
5
accepted Maps between tangent space of $X=\mathbb{V}(x^3-y^2)$ and $Y=\mathbb{V}(x^4-y^3)$
Jun
5
comment Maps between tangent space of $X=\mathbb{V}(x^3-y^2)$ and $Y=\mathbb{V}(x^4-y^3)$
@karl_christ, thanks! I will study your answer!
Jun
5
comment Maps between tangent space of $X=\mathbb{V}(x^3-y^2)$ and $Y=\mathbb{V}(x^4-y^3)$
@karl_christ, thats all right:) then could you help me check this exercise? Particularly the 3rd question.
Jun
5
comment Maps between tangent space of $X=\mathbb{V}(x^3-y^2)$ and $Y=\mathbb{V}(x^4-y^3)$
@karl_christ, isn't it common in algebraic geometry? Given a variety $X=\mathbb{V}(F_1,\cdots,F_r)$, then the tangent space of $X$ at $p$ is the variety $\mathbb{V}(d_pF_1,\cdots,d_pF_r)$ where $d_pF$ is the taylor expansion of $F$ to the first order.
Jun
5
asked Maps between tangent space of $X=\mathbb{V}(x^3-y^2)$ and $Y=\mathbb{V}(x^4-y^3)$
Jun
5
accepted What is the minimal depth of a decision tree if it grows to full size?
Jun
1
asked What is the minimal depth of a decision tree if it grows to full size?
May
30
asked Equivalent definitions of Jacobson rings
May
30
accepted What is the union of two varieties