wj32
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 Mar18 reviewed Approve is there a way to split this sum into 2 parts Sep30 awarded Explainer Jul16 awarded Yearling Jul2 awarded Curious Feb4 awarded Announcer Feb1 reviewed Reject Proof that the product of two differentiable functions is differentiable Dec25 reviewed No Action Needed Specific example of a quotient group Dec25 awarded Nice Answer Dec19 awarded Nice Question Nov27 awarded Self-Learner Nov20 comment If $L = \lim_{t\to \infty}f(t)$ prove that $\lim_{t\to \infty}(1/t)\int_0^tf(x)dx = L$ possible duplicate of Proving The Average Value of a Function with Infinite Length Nov14 comment Product of positive definite matrices not itself positive definite You should write out the steps in your second last paragraph and see if they actually work. Oct2 comment Relating Two Inner Products Without Orthogonal Basis There is no unique choice for $T$. You would expect that an arbitrary choice (e.g. choice of basis) has to be made at some point. Sep28 comment How to prove $(1+x)^n\geq 1+nx+\frac{n(n-1)}{2}x^2$ for all $x\geq 0$ and $n\geq 1$? $k+\frac{k(k-1)}{2}=\frac{(k+1)k}{2}$ Sep20 answered a - b > 0 algebra correction Aug22 comment Equation of first variation for a flow You know how to do the question now. Aug22 comment Equation of first variation for a flow It is equal to $D_x(F\circ\phi)$. Aug22 comment Equation of first variation for a flow 1. en.wikipedia.org/wiki/Symmetry_of_second_derivatives 2. $\frac{\partial}{\partial t} \phi(\mathbf{x},t) = \mathbf{F}(\phi(\mathbf{x},t))$. Aug22 comment Equation of first variation for a flow 1. What do you know about functions that are of class $C^2$? 2. What is the definition of flow? Aug22 answered Equation of first variation for a flow