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Feb
10
revised How to prove the number of images of two mirrors inclined at $A$ is $360/A -1$
edited body
Feb
10
asked How to prove the number of images of two mirrors inclined at $A$ is $360/A -1$
Jan
24
awarded  Popular Question
Jan
21
comment How to find the closed solution for the following recursive vector equations?
OK. I am waiting for other solutions if any.
Jan
21
comment How to find the closed solution for the following recursive vector equations?
@heropup's solution in his comment seems to be much more better.
Jan
21
comment How to find the closed solution for the following recursive vector equations?
+1 but I am waiting for the complete solution. :-)
Jan
21
comment How to find the closed solution for the following recursive vector equations?
@heropup: I think it should be $\sqrt{k-1}$ rather than $\sqrt{k}$.
Jan
21
comment How to find the closed solution for the following recursive vector equations?
@heropup: You can submit it as your answer, but don't forget to write the process. I will give you a bounty of 500 if it is the only possible solution.
Jan
21
comment How to find the closed solution for the following recursive vector equations?
I will give a bounty of 500 for the first correct answer!
Jan
21
revised How to find the closed solution for the following recursive vector equations?
added 50 characters in body
Jan
21
comment How to find the closed solution for the following recursive vector equations?
Note that I have updated the question in $\vec{r}_{n-1}\cdot\hat{v}_n=0$.
Jan
21
asked How to find the closed solution for the following recursive vector equations?
Dec
31
answered Necessity of learning programming for math major.
Dec
14
accepted How to prove by contradiction that there is only one circle with the given segment AB as its diameter?
Dec
14
comment What will be the length of slower train?
Length in the title but speed in the body, so what is the correct question?
Dec
14
comment What will be the length of slower train?
Title and body are out of sync!
Dec
14
comment What will be the length of slower train?
Make sure the question was correctly typed first!
Dec
14
comment What will be the length of slower train?
According to Newton's first law, the speed will be constant if no external force.
Dec
14
comment What will be the length of slower train?
70 km/h????????
Dec
3
answered How to prove by contradiction that there is only one circle with the given segment AB as its diameter?