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1d
awarded  Nice Answer
1d
revised Chinese remainder theorem for three equations?
added 447 characters in body
1d
answered The Predual of a von Neumann algebra
1d
comment Analytical result for element-wise vector division?
Vector-matrix multiplication? But elementwise division is of no help for that.
1d
answered Chinese remainder theorem for three equations?
2d
comment Conditional Expectation for IIDs
What is $E[X+Y \mid X + Y]$?
2d
comment Help with Euler Equations
The second derivative part is a bit tricky. You want to think of $\dfrac{d^2y}{dt^2} = \dfrac{d}{dt} \dfrac{dy}{dt}$. You already know how to write the "inner" $dy/dt$ in terms of $dy/dx$ and $t$. Use the product rule on this, and then again $\dfrac{d}{dt} = \dfrac{dx}{dt} \dfrac{d}{dx}$.
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comment Help with Euler Equations
It's not a nonlinearity: the Euler equation is as linear as they come. What it removes is the presence of non-constant coefficients.
2d
answered Conditional Expectation for IIDs
2d
answered $A$ be a convex subset and $D$ be dense in a real NLS ; then for every non-empty open subset $U$ of the NLS , $U\cap D\cap V \ne \phi$?
2d
comment Interesting Combinatorics question relating the coefficients of variables in Pascal's Triangle
If $b \ge 1$, it suffices to have $a \ge 3 b$.
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comment System of equations to solve this nested radical.
The point is that there isn't anything special about this. You have a target number $1.74793$ and a function $f(A)$, and you found a value of $A$ such that $f(A) = 1.74793$.
2d
comment System of equations to solve this nested radical.
If $f$ is a continuous function on $[a,b]$ with $f(a) < c < f(b)$, the Intermediate Value Theorem says there is some $x \in (a,b)$ with $f(x) = c$. You seem to have found that $x$ in the case $f(A) = \sqrt{1/A} \sqrt{A + 2 \sqrt{A + 2\sqrt{A + \ldots}}}$ and $c = 1.75793$.
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comment Does this function achieve a maximum or minimum?
That's part of it.
2d
answered Does this function achieve a maximum or minimum?
Jul
26
answered How to find median from a probability distribution?
Jul
26
answered Choose initial values such that sequence always has integer values
Jul
26
comment On Period of Linear Recurring Sequences modulo $P^e$
Don't confuse the integers mod $p^e$ with the finite field $\mathbb F_{p^e}$. They are quite different.
Jul
26
comment Interesting Combinatorics question relating the coefficients of variables in Pascal's Triangle
Because if $b$ is small and $a$ is large, ${a \choose b} > {a+1 \choose b-1}$.
Jul
26
comment Interesting Combinatorics question relating the coefficients of variables in Pascal's Triangle
What's the question? You can't prove something that isn't true.