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Apr
22
comment Curve that lies on a solution surface
@user this is beyond me at this point
Apr
22
comment Curve that lies on a solution surface
@user for example, the surface where $f(x,y,u) = \sqrt{2}$ would certainly be a constant but non-zero $f$
Apr
22
comment Curve that lies on a solution surface
@user i think "$f$ is constant" and $f=0$ are not the same, but latter is special case of the former
Apr
22
comment Curve that lies on a solution surface
@user likely because you want to claim something about all curves in the solution surface with some nice properties
Apr
22
comment Finding upper bounds of a set
Yes, it is correct.
Apr
22
comment Curve that lies on a solution surface
@user if you like, this can be said.
Apr
22
comment Recurrence Relations with Geometric Series
@MD_90 not so simple. Notice that $5^{k-1} >> 2^k$ even though the exponent is smaller since $2^k = 2 \cdot 2^{k-1}$...
Apr
1
comment Is this statement correct $f(n) = \theta(n) \land g(n) = \Omega(n) \Longrightarrow f(n)g(n) = \Omega(n^2)$?
@Rinzler yes indeed
Mar
18
comment How do I solve this equation when x approaches zero?
Do you know Taylor series or L"Hospital's Rule? Both would work here...
Mar
9
comment Solve the Lagrangian dual problem
@e2l3n I don't think so, but it's been a while since i looked at these
Mar
4
comment Does the series $\sum_{n=1}^{\infty} \frac{(-1)^n}{n(\sin(n)+2)}$ converge or diverge?
+1, Nice problem :)
Feb
24
comment Is there something wrong with my interchanging of sums and integrals?
@DDaren please see the update - sum is still incorrect
Feb
24
comment Is there something wrong with my interchanging of sums and integrals?
@DDaren yes, it is
Feb
24
comment Is there something wrong with my interchanging of sums and integrals?
@DDaren see no easy way to simplify this, will definitely depend on $A(\cdot)$. Note that it is $$a_1 + 2 a_2 + \ldots x A(x) = A(x) + A(x)-a_1 + A(x)-a_1-a_2 \ldots$$ perhaps this will take you somewhere... not sure how to evaluate this exactly...
Feb
15
comment Probability involving mean time failure
Do you know about exponentially distributed random variables?
Feb
15
comment Is a constant ratio of zero a convergent sum?
@PepperSausage good point but he probably means $$\lim_{r \to 0^+} \sum ar^{k-1} = a...$$
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?
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