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Martin Sleziak
Martin Sleziak
8:18 AM
typo When checking posts and with \M, I noticed that sometimes people makes typos such as \Mathbb or \Mathcal (uppercase instead of lowercase).
However, this is ust a typo - not something caused by begingroup..endgorup.
I have edited this answer which contained the macro \Mat defined in the question: math.stackexchange.com/posts/348317/revisions
The definition of derivative I used is the following: $A$ is differentiable in $U$ iff there is a linear $A'(U) \colon \Mat_n(\R) \to \R$ such that $$ A(U+H) = A(U) + A'(U)H + o(\norm H), \quad H \to 0 $$ Then $A'(U)$ is called the derivative of $A$ in $U$. What definition do you know? — martini Jan 15 '14 at 14:20
I somehow missed that comment when I was searching for \norm: chat.stackexchange.com/transcript/88939/2019/6/1
 
Martin Sleziak
Martin Sleziak
8:48 AM
Actually, the comment appears in the results of this:
But I did not copied the comments from the query here into chat back then.
search comments Comments with \Mat and without \Math: data.stackexchange.com/math/query/1071502/…
 
 
2 hours later…
Martin Sleziak
Martin Sleziak
11:21 AM
data-explorer posts Mosts often I search for posts which contain the macro name and do not contain macro definition. Sometimes I want to look at all posts containing the given macro name - as I did for \Math above: data.stackexchange.com/math/query/920313/…
 
 
5 hours later…
Martin Sleziak
Martin Sleziak
4:26 PM
I have edited this answer: math.stackexchange.com/posts/1146503/revisions It contained the macro \MaxD which was defined in the question.
It seems unlikely that a macro with such unusual name appears elsewhere, but let's check anyway. (Perhaps one could expect some occurrences in other posts by the same user.)
One could imagine that some users might use things such as \Max, \Min, \Sup, \Inf, \Map as names of macros.
There are some comments which contain a macro starting with \Inf - but it is not defined anywhere on the page.
 
Martin Sleziak
Martin Sleziak
5:19 PM
I have edited this post, which contained \Mod and \Th: math.stackexchange.com/posts/2339924/revisions
There are also a few comments below this answer:
I mean, isn't $\Th(K_1 \cap K_2) = \emptyset$ and $\Mod(\Gamma \cap \Delta) = \emptyset$? — user313212 Jun 28 '17 at 22:33
@user313212 Say that $\phi$ is the sentence $\forall x (x = x)$. It sounds like you're saying that this sentence is not in $\Th(\emptyset)$. Looking at the definition of $\Th(K)$, what would it mean for $\phi$ not to be in that set? — Gregory J. Puleo Jun 28 '17 at 22:57
You are right, what I wrote above is false. So really $\Th(\emptyset)$ is just the set of all sentences that are tautologies, right? Those that are modeled by the empty set. But any of those sentences would be in both $\Th(K_1)$ and $\Th(K_2)$ as well. — user313212 Jun 28 '17 at 23:08
Using a tautology may have been misleading on my part. Let's look at the sentence $\phi$ given by $\forall x (x \neq x)$ instead. What would it mean to have $\phi \notin \Th(\emptyset)$? — Gregory J. Puleo Jun 28 '17 at 23:12
search posts Posts with \Th and without \Theta or \\Th: data.stackexchange.com/math/query/1071496/…
search comments Comments with \Th and without \Theta:data.stackexchange.com/math/query/1174397/…
 

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