Gyu Eun Lee
Reputation
8,905
Top tag
Next privilege 10,000 Rep.
Access moderator tools
 2d reviewed Reviewed Departure from uniformity in a continuous (time) distribution 2d reviewed Close Union of three independent events 2d reviewed Leave Open Prove that if $x \neq 0$, then if $y = \frac{3x^2+2y}{x^2+2}$ then $y=3$ 2d reviewed Close Vectors expressed as combo of two other vectors 2d reviewed Close Element of one subspace not part of the other? 2d reviewed Close Net Present Value 2d reviewed Close Hyperbolic line with isometry. 2d reviewed Reject Linear objective with quadratic constraints Jul25 comment Identity Principle type question: Prove that $f=g$ @Scounged $w_n$ is needed. $f$ and $g$ have the same image, but a priori need not be the same function. Jul17 comment Example of function in $H^1(U)$ which is not continuous, where $U \subset R^2$ has a smooth boundary. Ok. See the answer at math.stackexchange.com/questions/569390/…. Jul17 comment Example of function in $H^1(U)$ which is not continuous, where $U \subset R^2$ has a smooth boundary. Take a smooth function on the disc (even continuous to the boundary) and change it arbitrarily at a single point, so that it has a removable singularity. Is this enough, or do you want to specify some more pathological behavior? Jul16 awarded Enlightened Jul16 awarded Nice Answer Jul15 revised What is the intuition behind generating functions? What makes them valuable? edited tags Jul15 revised What is the intuition behind generating functions? What makes them valuable? added 21 characters in body Jul15 comment Are there any two triangular numbers that add up to a perfect cube? Very nice! The less experienced among us could come up with this via the picture proof that the sum of two consecutive triangular numbers is a square number, and all square numbers are found this way. Then it reduces to finding squares that are also cubes. Jul15 comment “Grouping” differential equations and the appropriate methods for solving them Did you cover integrating factors? This is often the first thing a typical US intro ODEs class covers. Jul15 answered Lemma 2 - p.204 (Differential topology - Guillemin and Pollack) Jul15 comment Out of all the proofs of the PNT, which one is the most accessible? Here is an interesting viewpoint: tricki.org/article/… Jul15 answered What is the intuition behind generating functions? What makes them valuable?