Given metric space $\\langle X,d\\rangle$ and closed subset $A ...
Oct 27, 2025 · I've got this question as homework in my Topology course and having it difficult to solve Question Given metric space $\langle X,d\rangle$ and closed subset $A ...
partial differential equations - What is convection-dominated pde ...
Feb 12, 2014 · Can you explain for me what is convection-dominated problems? Definition and examples if possible. Why don't we can apply standard discretization methods (finite difference, finite …
linear algebra - What does it mean if $\det (A)$ equals $1 ...
Mar 9, 2014 · What does it mean if $\\det(A)$ equals $1$? Does it mean that the identity matrix can be obtained from $A$ by only adding multiples of rows onto others?
Is thi set of vectors, $\ { (2, 1), (3, 2), (1, 2)\}$, is linearly ...
When you have vectors like $\displaystyle\left [\begin {array} {c}1\\2\end {array}\right]=1\mathbf {i}+2\mathbf {j}$, they live on the plane where there are essentially two different directions: left/right …
Repeated alphabet in n^r - Mathematics Stack Exchange
Dec 22, 2018 · We already are accounting for the repeated alphabet. That $26^3$ comes from answering three questions: What is the first letter? What is the second letter? What is the third letter? …
calculus - Jacobian matrix for $f (h)=hh^Th$, where $h$ is an $m ...
Apr 19, 2014 · I have a function f(h) = hhTh, can we say ∇f(h) = 2 ∗ hhT +hThIm×m, where Im×m is an identity matrix?
Sum of quadratic residues. - Mathematics Stack Exchange
Sep 21, 2019 · I reckon it adds up to the number of quadratic residues minus the number of quadratic non-residues.
Geometric construction of a fillet? - Mathematics Stack Exchange
Nov 20, 2019 · I'm currently working on a library for OpenSCAD which can make 2D sketches with more features. I'm currently struggling with the geometric construction of a fillet given 2 lines in the xy …
Rotman introduction to theory of groups exercise
Apr 13, 2017 · What is $ (H, [G:H])$? Thi is a pair of a subgroup with an index...
Theorem that von Neumann proved in five minutes.
Feb 1, 2014 · Is thi srelated to the anecdote about a student coming late to class, copyiing what he thinks is a problem from the blackboard, handing in a solution next time saying "todays homework …