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12h
comment the multiplication of two derivative is positive
So, what are you going to do, Evangelina?
12h
comment How are they simplifying this equation? I'm confused.
Good. So maybe you can edit it in light of the comments, and then post an answer?
18h
revised How to find the nth term of this sequence?
edited tags
18h
answered Modulo operations over Gaussian Integers
18h
comment Negative integers congruent modulo m
"Then $b=a+sm$" makes no sense, when you haven't told us what $b$ means, and what $s$ means. What you want to do is divide $a$ by $m$ to get a quotient $s$ and a remainder $b$, with $0\le b\le|m-1|$ (which you can do by the Division Theorem). Then you will have your $a=ms+b$, and the congrunce follows immediately from the definition of $\equiv$.
18h
comment GCD and remainders
$a$ and $b$ leave the same remainder when you divide by $c$ if and only if $b-a$ is a multiple of $c$, right? So the biggest $c$ you can take is $|b-a|$, right?
18h
comment Finding coordinate vector of a point reflected
"I'm pretty sure this is exactly what the question is." Why aren't you absolutely sure this is what the question is? Look, either you have left something out, or the person who posed the question has left something out. Just think about it for a minute. Suppose $p=(1,0)$, and $a$ is the origin, and $d=(0,1)$. Then any vector $(-1,y)$ works as the coordinate vector of the kind of point you want, no matter what $y$ is. Right?
20h
awarded  Nice Answer
1d
comment Limit of polynomial times logarithm
Wake up, Admir!
1d
comment Specific order sequence as subset of other sequence
Also posted to (and closed on) MO, without notice to either site: mathoverflow.net/questions/201463/…
1d
comment Prove that if the angle between any two of $k$ distinct vectors of Euclidean space $V$ is $\pi/3$ then $k \leq \dim V$
Try to prove that, under the hypothesis, the vectors are linearly independent.
1d
comment Covering an mxn grid
I'm voting to close this question as off-topic because OP has abandoned it.
1d
comment Recurrence relation for right-angled triangles stuck-together
Isn't it???????
1d
comment (x,y) coordinates from gluing together a sequence of right triangles with arbitrary angles
I'm voting to close this question as off-topic because OP has abandoned it.
1d
comment How are they simplifying this equation? I'm confused.
Anything to say, fatwalrus?
1d
comment Number System Conversion
I don't know why you think the question requires a fractional base system. Why can't it be about base 10?
1d
revised Number System Conversion
edited tags
1d
revised Graphical transformation
edited tags
1d
comment Finding coordinate vector of a point reflected
That definition of $Q$ isn't good enough as there are many points $Q$ satisfying those conditions, only one of which is the one you want. Are you sure you're not leaving something out?
1d
revised Finding coordinate vector of a point reflected
formatting