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1d
asked Why $-1 \leq\frac{\langle A,B\rangle}{||A||\, ||B||}\leq1$?
2d
reviewed Approve Why is determinant called volume of the fundamental parallelepiped in geometry of numbers?
2d
comment About the differentiability of $|x|$?
Exactly. I was a little bit lazy when typing, sorry.
2d
comment About the differentiability of $|x|$?
I made a silly mistake, my impression was actually: I am starting to guess that for a function to be differentiable at a point, all it's derivatives should also be continuous at the same point.
2d
comment About the differentiability of $|x|$?
Sorry, I made a mistake, it's actually: I am starting to guess that for a function to be differentiable at a point, all it's derivatives should also be continuous at the same point.
2d
revised About the differentiability of $|x|$?
added 4 characters in body
2d
comment About the differentiability of $|x|$?
@Rahul Isn't $|x|$ sometimes defined as $\sqrt{x^2}$?
2d
asked About the differentiability of $|x|$?
Apr
12
accepted Prove that $(A,B)\sim(P,Q)$ and $(C,D)\sim (P,Q)\implies (A,B)\sim (C,D)$?
Apr
12
asked Prove that $(A,B)\sim(P,Q)$ and $(C,D)\sim (P,Q)\implies (A,B)\sim (C,D)$?
Apr
6
accepted Equations of the tangent lines of $y=x^4$ at the point $(2,0)$?
Apr
4
comment Equations of the tangent lines of $y=x^4$ at the point $(2,0)$?
@DanielEscudero Yes! There are lines in both directions. That should explain the lines.
Apr
4
comment Equations of the tangent lines of $y=x^4$ at the point $(2,0)$?
@DanielEscudero Yes. I also think it's weird to ask about lines, In my mind, I also think it's only one line. But he used the plural retas in here.
Apr
4
comment Equations of the tangent lines of $y=x^4$ at the point $(2,0)$?
@DanielEscudero Oh, I get it. What is being asked is the equation of the line that passes through $(2,0)$ and touches the curve. I guess it's this.
Apr
4
asked Equations of the tangent lines of $y=x^4$ at the point $(2,0)$?
Apr
3
comment What is the meaning of division for quasigroups in here?
@vadim123 Oh yes. Sorry. I was too lazy that I didn't even think about googling quasigroups. I blame the lack of coffee.
Apr
3
asked What is the meaning of division for quasigroups in here?
Apr
3
asked Determine the equation of the tangent line to $P=(x_0,x_0^4)$ in $y=x^4$.
Apr
2
accepted How to show that $\frac{-1}{x^2}=0$ has no solutions?
Apr
2
comment How to show that $\frac{-1}{x^2}=0$ has no solutions?
Good. But multiplying both sides by $x^2$ is the only possible operation to solve that, isn't it?