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11h
comment Integral of the product of two functions, one of which is unknown.
$F$ is a function -- I thought you intended an indefinite integral. If this is indeed the case (i.e. $F$ is a constant function), there is nothing wrong with $z=0$ -- indeed, $$\int f(x)z(x) dx = \int 0 dx = \text{const}\ldots$$ But there is a different counterexample. The additional information is assumption needed to avoid the counterexample...
15h
revised Not independent Increments
added 67 characters in body
15h
answered Integral of the product of two functions, one of which is unknown.
16h
answered How did the solution to this system of equations get a power of n?
16h
comment $n$th derivative of $\sin(nx)$?
Please update your question with your computations. Do you see a pattern perhaps?
16h
comment $n$th derivative of $\sin(nx)$?
Please update the question with your thoughts and we will be happy to give you a hint. Can you compute $f'(x), f''(x)$ and $f'''(x)$ for $f(x)=\sin(nx)$?
17h
comment I'm having a problem with this number and digits problem. What to do?
@BomminKun old advatage of Estrade: $E-A$, new majority: $E/3-A/2$, the equation should be $$(E-A) - 200 = \frac{E}{3} - \frac{A}{2}$$
1d
answered I'm having a problem with this number and digits problem. What to do?
1d
revised I'm having a problem with this number and digits problem. What to do?
deleted 1 character in body; edited tags
1d
comment Generation of random variable from a complicated CDF
note the RHS is a constant and the LHS is a function of $x$, please fix the bug
1d
revised Generation of random variable from a complicated CDF
deleted 137 characters in body; edited tags
1d
comment How to complete this proof? Union of a countably infinite set and a finite set is countably infinite
@Stefan you are probably right...
1d
comment Finding the sum of a series derived by Nernst equation
What is $m_r$ given by? or is there another equation relating $U_r$ and $m_r$?
1d
revised Finding the sum of a series derived by Nernst equation
added 51 characters in body
1d
comment How to complete this proof? Union of a countably infinite set and a finite set is countably infinite
First (why) $|X \cup Y| \ge |X| = +\infty$
1d
revised Percentage change using differentials.
edited tags
1d
answered Percentage change using differentials.
Sep
2
comment How do i show V is a linear subspace if it's defined like this?
What do you need to show is a linear subspace -- $V$ or $T(V)$?
Sep
2
comment Proof of Vandermonde's Identity using a “different approach” using complex integration
yes, i think this is right
Sep
2
comment Proof of Vandermonde's Identity using a “different approach” using complex integration
+1, interesting, i like it