Linked Questions

3
votes
3answers
3k views

LyX: How to combine two math symbols? [duplicate]

I'm a new user of LyX. I'm using it to write math lectures. How can I make a new symbol from two existing ones? To be more precise, how can I create this: It's a subset with a circle in it (\subset, ...
2
votes
1answer
394 views

superimosing {\circ} on {\sum} in {math-mode} [duplicate]

Possible Duplicate: \subseteq + \circ as a single symbol (“open subset”) Is it possible to superimpose a variable size \circ on \sum to compose a symbol just like \oint?
142
votes
3answers
272k views

\Rightarrow vs. \implies, and “does not imply” symbol

Is it better to use \Rightarrow or \implies to symbolize logical implications? Why? Also, if I write \not \Rightarrow, I get a symbol that means "does not imply." But if I type \not \implies, it ...
50
votes
4answers
2k views
+200

How do you make your own symbol when Detexify fails?

My first visit to TeX.SX came when I was looking for a symbol for a twisted product: I knew about Detexify and the Comprehensive LaTeX Symbol List, but I could not find the symbol there. I tried the ...
21
votes
6answers
2k views

LaTeX command for symbol needed. looks like crossed equal

I can’t find the LaTeX command for the symbol below. Can anyone help me out to find this symbol? I wasn't able to find it with Detexify.
37
votes
5answers
39k views

What's the most elegant way to obtain Dirac operators? (slash notation)

What's the best way to achieve the Dirac slash notation for Dirac operators (contraction with Gamma matrices)? I would have thought the AMSmath packages would have this built in somewhere. (The ...
37
votes
3answers
650k views

Not equal sign (≠) with a vertical bar

Is it possible to get a \neq but with a vertical bar instead of a slanted one? There are inequality operators like AMS's \gvertneqq that feature this kind of "not equal" but not without mixing it with ...
29
votes
5answers
1k views

How to make a plus sign with arrowheads on each of the four endpoints?

There is a common operation in the sparse-direct literature (see pg. 7) called an "extend-add", and it is usually denoted with a particular symbol that looks like a large plus sign with arrowheads on ...
35
votes
3answers
12k views

Overlay symbol with another

Is it possible to overlay a symbol with another? I want to write an equal sign with a question mark overlayed (or the other way around). Note I don't want \stackrel{?}{=} I want the question mark ...
21
votes
6answers
2k views

What is the LaTeX symbol for “forking independent” (model theory)?

I am looking for a way to set the symbol for "forking independent" (for example, see "Essential Stability Theory", Steven Buechler, p.217). It looks a bit like an anchor or an upside-down 'T' with a ...
36
votes
4answers
170k views

A better \pm symbol

I am looking for an alternate to the \pm symbol, and wondering if I am the only one bothered by it as I see that this has not been asked yet. I have attempted to define one using my standard ...
26
votes
3answers
11k views

Highlight a table row with a rectangular overlay

I am trying to highlight the row of a table by drawing a rectangle over that row. A wrinkle is that the code for the table is pre-written from external statistical software and then included in the ...
23
votes
4answers
7k views

What is the command for a sum symbol superimposed on an integral sign?

I want to express a sum over all discrete states and an integral over all continuum states. Usually, the sign for this is a $\sum$ superimposed on an $\int$. Is there a command to make this symbol? If ...
20
votes
3answers
6k views

How to type NOT \delta and NOT \ll

In proximity theory, we use \delta and \ll as binary relations on the power set of a set X. How can one display NOT \delta or NOT \ll similar to how we can do \not\in. Using \not\delta and \not\ll ...
28
votes
2answers
24k views

divides, not divides and cardinalities

In group theory it happens very often that you want to say: "The order of $H$ divides / does not divide the order of $G$." But the length of | is then always the same: $ |H| | |G| $ produces |H|||G| ...

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