10h
comment Positive functions with zero integrals
So: given a (discontinuous) positive Riemann-integrable function, can you construct a lower sum that is positive? It takes some theory to be able to do that. Could it be that, although the function is ${} > 0$ everywhere, the infimum of the values on every open interval is $0$?
10h
comment Antonym for 'bound'
London-originating, perhaps.
16h
comment Do police issue more citations near the end of each month?
Perhaps at least specify "speeding tickets" or "parking tickets" and not "movie tickets" or "lottery tickets"
16h
comment Integrating: $ \;\int \frac{1}{x^2+3x+2} dx $
Or, seen another way, it works for all complex $x$ except the two poles $-1$ and $-2$.
17h
answered Integrating: $ \;\int \frac{1}{x^2+3x+2} dx $
17h
comment Self-study Linear Algebra textbook for ML and Stats
A linear algebra text that doesn't mention Cramer's rule?
17h
comment An adjective for gestalt
For gestalt, the OED has derivatives only gestaltism and gestaltist. It has no adjective like gestaltic. But you could probably use that and be understood.
17h
comment Weird "genitive of relative pronoun" construction
I wonder if there is any really good way to say this. Maybe: "...another verb, whose present tense I have already talked about"
18h
comment Integrating: $ \;\int \frac{1}{x^2+3x+2} dx $
This is the best way, presumably the one intended by the problem poser. Another way: complete the square in the denominator, the integral is an inverse hyperbolic tangent.
18h
comment Geographic distribution of people on MathOverflow
You mean Indiana is not in India?
18h
comment Is this topological looking space metrizable?
We need a reference for this "distance" notion, and the corresponding "creation" relation $\rightarrow$.
1d
comment >>A. $X$ banch. >>B.M banach. >>C. $X/M$ banach.
Statement not clear. You want to show if $X/M$ is a Banach space then $M$ is closed? Or you want to show if $X/M$ is a Banach space then $M$ is a linear subspace? Or what?
1d
comment Logic - how to write $\exists !x$ without the $\exists !$ symbol
There exists at most one ... that means, one exists, and all of them are equal. right?
1d
comment Grade 1 Students on Password
If you re-post the question on another site, put the link here for those interested.
1d
comment Convergence of $ \sum_{n=1} ^\infty \frac {1}{n(1+\frac {1} {2}+\frac {1} {3}+ \cdots+\frac {1} {n} )}$
In asymptotic statements, I prefer not to say "for $n$ sufficiently great" but instead "as $n \to \infty$".
1d
comment What is the derivative of (Ax)'
First you need the definition for "derivative" of a function of many variables (or a function of a vector). What is the one you are using? (Without a definition, there is no hope of proving anything about it.)
1d
comment Is it acceptable to use a single hyphen as a dash (as the BBC does)?
I'm guessing they have a guide that allows only a limited character-set. Perhaps a British version of ASCII. So hyphens, dashes, minus-signs, etc., all have to be simulated using that one available character.
1d
comment Proof that there is no identity to integral operation on any set of functions
What David said. Certainly for a small enough space $F$ (say, finite-dimensional), there is such $I$.
1d
comment Limit $\lim \limits_{x\to0}{\frac{\ln(x+1)}{2^x-1}}$ wihout LHospital
I once saw a copy of a letter written by the man himself, where he wrote it as Lhospital ... so I guess French spelling has changed since then anyway.
2d
answered What are the negative consequences of slacking off after attaining tenure?
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