What the LaTeX code is for this fancy 0?  I have been looking for the LaTeX code for this zero-like symbol and I can't seem to find it anywhere.
1659
I know what my symbol or character looks like, but I don't know what the command is or which math alphabet it came from. How do I go about finding this out?
29104
Can any one suggess me the code to write this equation in LaTeX.
1425
How can the special characters { and } be written literally to an external file in LaTeX, without being balanced?  Obviously the following does not work:   \immediate\write\my@outfile{{}  \immediate\write\my@outfile{}}
107201
I'm just starting to learn LaTeX. I tried typing \begin{equation*}  (math goes here)  \end{equation*}  and I got a whole bunch of errors. It seems LaTeX interpreted the empty line as the equation: when it saw nothing there, I guess it just ended math mode? It then said my other commands needed $'s so I assume that's what happened. When I typed \begin{equation*} (math goes here) \end{equation*}  everything was fine. So I'm confused. If LaTeX sees an empty line in an environment, does it just interpret this as me changing my mind, and deciding not to use the declared environment?
5639
Is there a symbol that looks like the element sign $\in $ but instead of being curved, looks more like a less than sign $&lt; $? I have trawled through hundreds of symbols and tried detexify.
40427
I'm looking after a macro to write the (La)TeX logo (with parentheses), i.e. something similar to \TeX, \LaTeX, but where the output includes ()'s.
40738
What does $\mathbb{Z}[[t]]$ mean? Why are there double square brackets?  I can't search through Google, because I can't search Latex.
35744
I use TeX Live. See my example:  \documentclass{article} \usepackage[utf8x]{inputenc} \usepackage[english]{babel} \begin{document} Check ligatures: ﬁrst % here I have ligature for "fi" \end{document}   I have Unicode symbol here: ﬁ. When I compile the above LaTeX file I get:  ! Package ucs Error: Unknown Unicode character 64257 = U+FB01  Then I apply the LaTeX system recommendation and compile the following file:  \documentclass{article} \usepackage[utf8x]{inputenc} \usepackage[english]{babel} \DeclareUnicodeCharacter{FB01}{ﬁ}% Here I defined a Unicode ligature \begin{document} Check ligatures: ﬁrst \end{document}   But when I compile this LaTeX file I get:  ! Missing number, treated as zero. &lt;to be read again&gt;                    F l.4 \DeclareUnicodeCharacter{FB01}{ﬁ}  So my question is: How can I input ligatures in a LaTeX file using just the ligature's Unicode symbol?
104754
I'm trying, but something is wrong with my code in LaTeX: \begin{asy} pair dynkinMark(real x, real y, string s = &quot;&quot;, pen p = defaultpen, pair B = dir(45)) { if (s != &quot;&quot;) { dot(&quot;$&quot;+s+&quot;$&quot;, (x,y), B, p); }     else { dot((x,y), p); }     return (x,y); }  dynkinMark(0,1, &quot;1&quot;, dir(135)); dynkinMark(0,2, &quot;2&quot;, dir(135)); dynkinMark(0,3, &quot;3&quot;, dir(135)); dynkinMark(0,4, &quot;4&quot;, dir(135)); dynkinMark(7,1, &quot;1'&quot;); dynkinMark(7,2, &quot;2'&quot;); dynkinMark(7,3, &quot;3'&quot;); dynkinMark(7,4, &quot;4'&quot;); path p1 = (0,1)..(2,2.0)..(5,3.5)..(7,4); path p2 = (0,2)..(2,1.2)..(5,2.5)..(7,3); path p3 = (0,3)..(2,2.8)..(5,1.5)..(7,1); path p4 = (0,4)..(2,3.8)..(5,3.5)..(7,2); draw(p1, blue); draw(p2, heavycyan); draw(p3, mediumcyan); draw(p4, lightblue); dot(&quot;$12$&quot;, IP(p1, p2), dir(90), heavygreen); dot(&quot;$13$&quot;, IP(p1, p3), dir(90), heavygreen); dot(&quot;$23$&quot;, IP(p2, p3), dir(90), heavygreen); dot(&quot;$14$&quot;, IP(p1, p4), dir(90), heavygreen); dot(&quot;$24$&quot;, IP(p2, p4), dir(90), heavygreen); real y = 0.8; label(&quot;$s_1$&quot;, (IP(p1,p2).x, y), heavygreen); label(&quot;$s_2$&quot;, (IP(p1,p3).x, y), heavygreen); label(&quot;$s_1$&quot;, (IP(p2,p3).x, y), heavygreen); label(&quot;$s_3$&quot;, (IP(p1,p4).x, y), heavygreen); label(&quot;$s_2$&quot;, (IP(p2,p4).x, y), heavygreen); \end{asy}
13187
Why does the following code does'nt work when i am using PDFLaTeX or just LaTeX ? I tried it in different editors as well.  This is the code   $\{f^'_n\}$   Surprisingly it works on Math.SE site
29819
How do I insert the line "|" after the equation in LaTeX (see image below)? I'm using LyX so if you can point me to the symbol of that line is also OK.    I don't know if this line has a proper name so the title of this question may be very vague. If you could provide me a name, I'll edit this question's title.
21383
How can I make LaTeX use symbols (*, †, ‡, and so on) instead of numbers to mark footnotes?  (The numbers are confusing because I use superscripted numbers for citations.)
62859
. It is a mathematical expression/sequence/set of numbers with the arrow exactly under any one of the numbers (with or without n= 0). How to do it in latex? Any of the up arrow types (single line or double line) shown in the figure is okay.
24315
Is there any pros and cons for using of Unicode (and vice versa) in LaTeX equations?  Consider two examples:  \lim_{h→0}∫_{x_0}^{x_0 + h}\frac{f(t)}{h} = f(x_0)  x_0 ⇔ ∀ 𝜀 &gt; 0, ∃ 𝛿 &gt; 0,(|x-x_0| &lt; 𝛿 ⇒ |f(x)-f(x_0)| &lt; 𝜀)   And without Unicode:  \lim\limits_{h \to 0}\int\limits_{x_0}^{x_0+h}\frac{f(t)}{h}=f(x_0)  x_0 \Leftrightarrow \forall\epsilon &gt; 0, \exists\delta&gt;0,(|x-x_0|&lt;\delta \Rightarrow |f(x)-f(x_0)|&lt;\epsilon)   With latest XeLaTeX the result is the same, so!, what's better?
66734
I  there's a LaTeX package for printing the text of "lorem ipsum".  Surely then, there's also a macro / package for writing "LaTeX" (with the proper super-/subscript) in a document.  But I found googling for this a bit hard. ("LaTeX macro"? Probably not.)  Can any of you groks help me out here?
28119
What is the "best LaTeX practices" for writing absolute value symbols?  Are there any packages which provide good methods?  Some options include |x| and \mid x \mid, but I'm not sure which is best...
44031
How to create the following symbol?