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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
Jul
25
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.
Jul
17
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/….
Jul
17
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?
Jul
16
awarded  Enlightened
Jul
16
awarded  Nice Answer
Jul
15
revised What is the intuition behind generating functions? What makes them valuable?
edited tags
Jul
15
revised What is the intuition behind generating functions? What makes them valuable?
added 21 characters in body
Jul
15
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.
Jul
15
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.
Jul
15
answered Lemma 2 - p.204 (Differential topology - Guillemin and Pollack)
Jul
15
comment Out of all the proofs of the PNT, which one is the most accessible?
Here is an interesting viewpoint: tricki.org/article/…
Jul
15
answered What is the intuition behind generating functions? What makes them valuable?