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1d
reviewed Approve How do I find $\frac{d}{dz}\left(\frac{2z-i}{z+2i}\right)\text{?}$
1d
comment How to show that $0<b'<b$?
@rightskewed Yes! The condition of comparability of rational numbers. I had this insight yesterday but used in a cumbersome way that yielded nothing. Now I forgot to use it. Thanks!
1d
accepted Identify the subset of the plane composed by $R\cos \theta=5$ by means of polar coordinates $R,\theta$?
1d
accepted Why $-1 \leq\frac{\langle A,B\rangle}{||A||\, ||B||}\leq1$?
1d
asked How to show that $0<b'<b$?
Apr
16
asked Why $-1 \leq\frac{\langle A,B\rangle}{||A||\, ||B||}\leq1$?
Apr
16
reviewed Approve Why is determinant called volume of the fundamental parallelepiped in geometry of numbers?
Apr
15
comment About the differentiability of $|x|$?
Exactly. I was a little bit lazy when typing, sorry.
Apr
15
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.
Apr
15
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.
Apr
15
revised About the differentiability of $|x|$?
added 4 characters in body
Apr
15
comment About the differentiability of $|x|$?
@Rahul Isn't $|x|$ sometimes defined as $\sqrt{x^2}$?
Apr
15
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 $(2,0)$?