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Aug
9
revised Bridge between High School Mathematics and University-level Mathematics?
added 361 characters in body
Aug
9
answered Bridge between High School Mathematics and University-level Mathematics?
Aug
7
comment What is switching rows useful for?
Can you point me to some example in which this computation yields problems? It's not needed to type it if you don't want, referencing some book or article would be good.
Aug
3
asked What is switching rows useful for?
Aug
3
comment How do I express logical connectives with Nand?
@MauroALLEGRANZA You can use $\uparrow, \rightarrow, \downarrow, \leftarrow, \triangle, \times ,\bigcirc, \times, \square, \triangle$ to attack with Akuma's combo on Street Fighter $V$.
Aug
3
revised How do I express logical connectives with Nand?
added 172 characters in body
Aug
2
revised How do I express logical connectives with Nand?
added 170 characters in body
Aug
2
answered How do I express logical connectives with Nand?
Aug
1
reviewed Approve $\frac {1} {ab} + \frac {1} {ac} + \frac {1} {ad} + \frac {1} {bc} + \frac {1} {bd} + \frac {1} {cd}$
Jul
31
asked Why $\lim_{\Delta x\to 0} \cfrac{\int_{x}^{x+\Delta x}f(u) du}{\Delta x}=\cfrac{f(x)\Delta x}{\Delta x}$?
Jul
28
comment What's the meaning of the $R(f(x),g(x))$ in $\int R(f(x),g(x))?$
See Apostol's: Calculus or Courant/Fritz': Introduction to Calculus and Analysis.
Jul
28
asked What's the meaning of the $R(f(x),g(x))$ in $\int R(f(x),g(x))?$
Jul
27
comment What would be interesting maps to use on that Eudoxus reals?
@lulu Yes. But I'm not sure of what $f$ would be useful for this construction of the Eudoxus reals. I'm reading this but it doesn't ring a bell.
Jul
27
comment What would be interesting maps to use on that Eudoxus reals?
@lulu I don't get it. If I take $f(x)=mx+b$, I'd have: $$f(x+y)-f(x)-f(y)=m(x+y)+b-(mx+b)-(my+b)=-b$$ That doesn't seems meaningful.
Jul
27
asked What would be interesting maps to use on that Eudoxus reals?
Jul
22
awarded  Notable Question
Jul
21
accepted Minor mistake computing $\int \frac{1}{x^3+2x^2-3x} \; dx$?
Jul
21
comment Minor mistake computing $\int \frac{1}{x^3+2x^2-3x} \; dx$?
Oh, thanks. When I expanded it in the board, I (wrongly) found $-3c$. Now I expanded it with Mathematica and obtained the right result but didn't pay attention.
Jul
21
asked Minor mistake computing $\int \frac{1}{x^3+2x^2-3x} \; dx$?
Jul
18
asked Does this suggest a unique additive factorization on the rational numbers?