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 Feb 29 awarded Notable Question Feb 9 awarded Popular Question Dec 9 awarded Nice Question Oct 28 awarded Yearling Oct 11 awarded Popular Question Aug 5 awarded Popular Question 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.