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Feb
15
reviewed Approve What is sum of totatives of n(natural numbers $ \lt n$ coprime to $n$ )?
Feb
15
comment Analytical methods for solving polynomial
I don't understand the question. All these methods involve basically factoring the polynomial. What are you asking?
Feb
15
comment Expectation of stochastic differential equation
@user4514 i'm sorry, i scanned the lecture briefly but didn't see it. Can you please let me know where exactly is the counterexample?
Feb
9
reviewed Approve $\frac{\partial A(x, y)}{\partial x} = B(x)A(x, y), \; \frac{\partial A(x, y)}{\partial y} = -A(x, y)B(y), \; A(x,x)=I \implies A(x,y)A(y,z)=A(x,z)$
Feb
6
answered Solve $x^2f''(x)+f(x)=0$ check my answer
Feb
6
reviewed Approve Find $A^{100}+A^5$
Jan
30
awarded  Popular Question
Jan
28
comment Find the points where the function is continuous
Notice that $X$ is discrete. Let $x \in X$. What happens at $x$? What about at $x - \epsilon$ if you know $x -\epsilon \not \in X$?
Jan
26
comment Quickest way to determine a polynomial with positive integer coefficients
:-) A hi from one theoretician to another -- in theory beautiful but practically absolutely useless :-) +1
Jan
23
comment Quickest way to determine a polynomial with positive integer coefficients
I see the idea. But how would one practically determine the coefficients given the value on the output, especially in a computerized setting?
Jan
23
comment Quickest way to determine a polynomial with positive integer coefficients
I don't understand. Suppose you call the function and you now know $f(\pi) = 0$. What does that tell you about the coefficients or the degree of $f$?
Jan
20
answered Where did the $-1$ come from?
Jan
20
awarded  Peer Pressure
Jan
13
comment One hundred indistinguishable ants are dropped on a hoop of diameter 1
awesome thanks veryt helpful
Jan
13
comment One hundred indistinguishable ants are dropped on a hoop of diameter 1
But why are the two problems (with bouncing and without boncing) equivalent? I agree if they don't bounce it is trivial, but why are the answers the same for both cases?
Jan
13
comment Graphing a Piecewise Function
i wonder why did someone downvote this... perfectly reasonable to ask a question with own solution posted...
Dec
30
comment Integration with absolute value
@rogerl thanks, fixed - confused sine and cosine
Dec
30
revised Integration with absolute value
added 18 characters in body
Dec
30
answered Integration with absolute value
Dec
17
answered Finding the mass of a cone using triple integral