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Apr
13
reviewed Leave Open Determine the Taylor expansion for the solution of the differential equation
Apr
13
comment Diffeomorphism between a sphere and ellipsoid in $\mathbb R^3$.
If $S = \{x \in \mathbf R^3 \mid \|x-x_0\| = r\}$ is any sphere, note that $g \colon S^2 \to S$, $x \mapsto r(x+x_0)$ is a diffeomorphism between $S$ and $S^2$. Compose if with $f$.
Apr
13
answered Variant on Law of Iterated Conditioning
Apr
13
answered Regular expression. Proof.
Apr
13
reviewed Reopen If a certain group action fixes every element $x$ such that $x^4=1$, then the action is trivial
Apr
13
reviewed Leave Closed $z^n=(z+1)^n=1$, show that $n$ is divisible by $6$.
Apr
13
reviewed Leave Open Find gradient of a equi-angular spiral (log spiral)
Apr
13
reviewed Leave Open What is the reverse image of $f:[0,6\pi] \rightarrow \mathbb{R}$, $f = sinx$?
Apr
13
reviewed Leave Open Looking for a distribution to describe 2D “lines”
Apr
13
reviewed Leave Open writing down markov chain transition matrix
Apr
13
reviewed Leave Open Probability that random walkers meet
Apr
13
answered Diffeomorphism between a sphere and ellipsoid in $\mathbb R^3$.
Apr
13
answered How do I see that a homeomorphism $\sigma$ is an open function?
Apr
13
answered multivariable limit of $\frac{x^2-y^2}{\sqrt{x^2+y^2}}$
Apr
13
revised Continuity dot product
added 414 characters in body
Apr
13
comment Continuity dot product
Somewhere you'll have to use that $\mathbf R$'s topology is given by the absolute value or the order ...
Apr
13
revised Inverse Matrix in 3D
TeXification
Apr
13
answered Continuity dot product
Apr
13
answered How can I prove that $Set^I≃Set/I$?
Apr
10
answered How to prove $ \frac{1}{A+B} = \frac{1}{A} - \frac{1}{A} B \frac{1}{A} + \frac{1}{A}B \frac{1}{A}B \frac{1}{A} + \cdots $?