Activity for Michael Hardy
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #296273 |
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| Edit | Post #296273 |
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| Edit | Post #296273 |
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| Comment | Post #296264 |
@#117674 ok, Now I see what you meant by "set it off by line breaks." (more) |
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| Comment | Post #296264 |
It's working now, although nothing changed as far as I know. (more) |
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| Edit | Post #296262 |
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| Comment | Post #296272 |
@#117674 I'm guessing that's accusative. (more) |
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| Edit | Post #284408 |
Post edited: use of MathJax where appropriate |
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| Edit | Post #296273 | Initial revision | — | 3 months ago |
| Question | — |
"Weaker" versus "stronger" topologies When I first learned point-set topology, the textbook said analysts and topologists have incompatible conventions about the meanings of "stronger" and "weaker" as applied to topologies. One of them means "finer" and the other "coarser," but which is which depends on whether you're an analyst or a... (more) |
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| Edit | Post #296272 |
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| Edit | Post #296272 | Initial revision | — | 3 months ago |
| Answer | — |
A: What $\equiv$ called? It depends upon the context. I am mainly posting to address a kind of confusion that often arises. There are two conventions of terminology and notation in modular arithmetic, and one should be clear about which is which. Newer notation: I suspect this one was introduced around the middle o... (more) |
— | 3 months ago |
| Suggested Edit | Post #284408 |
Suggested edit: use of MathJax where appropriate (more) |
helpful | 3 months ago |
| Edit | Post #282060 |
Post edited: The percent sign had the effect of commenting out the rest of the line, making an essential part of what was written invisible. It needs a backslash. Then it's legible. Also, use of \text{} where appropriate. |
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| Edit | Post #296266 | Initial revision | — | 3 months ago |
| Answer | — |
A: Can expectation be calculated if the events aren't numbered? Putting letters instead of numbers on the six sides of a die does not change the codomain of the measure from $\mathbb R\cup\{\,+\infty,-\infty\,\}$ to something else. In fact, whether you use numbers or letters on the face of the die, the codomain of the measure is the set $[0,1]=\{\,x : 0\le x\... (more) |
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| Edit | Post #296262 |
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| Comment | Post #296065 |
Are you sure it wasn't for use of the central limit theorem rather than for use of the z-test? (Either way, it's not really good advice.) (more) |
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| Edit | Post #296263 |
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| Comment | Post #296264 |
I copied the code from this answer and pasted it into the question to which I linked. I don't know whether that changed anything or not, but it still doesn't work. (more) |
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| Edit | Post #296262 |
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| Edit | Post #296262 |
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| Edit | Post #296262 |
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| Comment | Post #296155 |
Are you familiar with the usual meaning of the term "analytic continuation"? (more) |
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| Edit | Post #296262 |
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| Edit | Post #296263 | Initial revision | — | 3 months ago |
| Question | — |
"align" in whatever software this site uses instead of MathJax `\begin{align}` . . . `\end{align}`, a standard thing in LaTeX and in MathJax, does not work on this site, as seen in this answer. Can this be fixed? (more) |
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| Edit | Post #296262 | Initial revision | — | 3 months ago |
| Answer | — |
A: Can the relative magnitude of standardized coefficients indicate variable importance? This can be hazardous if two predictors are correlated. For example, suppose one predictor is the amount of money a person spends on one kind of staple groceries and another is how much the same person spends on another kind of staple groceries. A person with a dozen dependents spends a lot on... (more) |
— | 3 months ago |
| Comment | Post #296065 |
Why 30? Normally for estimating the mean of a normal (or "Gaussian") population, I would use a t-distibution until the sample size is at least 100 or so. I wonder whether you may be confusing this with the rough (and not very good) rule of thumb that says the sampling distribution of the sample m... (more) |
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| Edit | Post #296257 |
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| Edit | Post #296257 |
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| Comment | Post #296123 |
`\prod` is designed to be used in the way you used it in this question. In "inline" (as opposed to "displayed") contexts, the subscript on `\prod` is below and to the right of the symbol, unless that is manually overridden, as by the use of `\displaystyle`. But in a "displayed" context, it is dir... (more) |
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| Comment | Post #282060 |
Does $99\%$ accurate mean only $1\%$ positive among healthy people, or only $1\%$ negative among those who have the disease, or maybe both? (more) |
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| Suggested Edit | Post #282060 |
Suggested edit: The percent sign had the effect of commenting out the rest of the line, making an essential part of what was written invisible. It needs a backslash. Then it's legible. Also, use of \text{} where appropriate. (more) |
helpful | 3 months ago |
| Edit | Post #296257 | Post undeleted | — | 3 months ago |
| Edit | Post #296257 |
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| Edit | Post #296123 |
Post edited: The code \mathcal{CB} was not between "dollar signs" and so not rendered. Using \prod rather than \Pi results in correct formatting of the subscript and other differences. |
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| Comment | Post #295614 |
There is no reason to think that the intersection of an open set in one topology and an open set in another topology must be empty. (more) |
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| Edit | Post #296257 | Post deleted | — | 3 months ago |
| Edit | Post #296257 |
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| Edit | Post #296257 |
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| Edit | Post #296257 |
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| Edit | Post #296257 |
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| Edit | Post #296257 | Initial revision | — | 3 months ago |
| Answer | — |
A: Why is the union of two topologies not in general a topology? Your last sentence makes me think you haven't understood your own question. There is no reason to think that the intersection of an open set in one topology and an open set in another must be empty. Consider the set $(0,1)\times(0,1).$ Let $\mathcal T1$ be the topology whose basic open sets ar... (more) |
— | 3 months ago |
| Comment | Post #296123 |
Typing `\text{glb}` rather than `\operatorname{glb}` results in lack of proper spacing in things like $3\text{glb}S$ rather than $3\operatorname{glb}S$ (the latter coded as `3\operatorname{glb}S`). In a long document, you needn't type all of `\operatorname` every time since you can define a short... (more) |
— | 3 months ago |
| Suggested Edit | Post #296123 |
Suggested edit: The code \mathcal{CB} was not between "dollar signs" and so not rendered. Using \prod rather than \Pi results in correct formatting of the subscript and other differences. (more) |
helpful | 3 months ago |