I'm trying to properly render the following formula:    This is what I've got so far:  aufgel"ost nach $B^A$ ergibt sich  \begin{equation}     \boxed{B^A = \mathit{VS} \cdot \frac{_{\textbar n}A_x + \mathrm{"a}_{x:n} \cdot \gamma}{(1 - \beta) \cdot \mathrm{"a}_{x:t} - t \cdot \alpha^Z}} \end{equation}  bzw. f"ur $t = n$   Rendered result:    However, I can't find the symbol for the actuarial angle for the letters n and t in the numerator and denominator in the AMS symbols list.
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How do you write this in LaTeX:
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When you read a formula aloud you say "r and r-star are related by this formula". If you write this formula down you normally write an r with a six-handed star, which would actually be an asterisk and not star (with 5 sharp hands) because it's easier to draw by hand.  But what to do when typing this formula in LaTeX? Should I set it as I pronounce it?  r^\star = a r   Or as I write it by hand?  r^\ast = a r   And will \ast always do the same as *?  r^\ast == r^* %???   Is one (\star or \ast) simply wrong (typographically or semantically) or is it just a matter of personal preference?
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My minimum working example:  \documentclass{report}  \usepackage{amsmath}  \begin{document}  \begin{center} \boxed{K_{k+1}=P_ka_{k+1}^T(a_{k+1}P_ka_{k+1}^T+I_N)^{-1}} \end{center}  \end{document}   The result:    Now how can I number this equation?
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I want to write an equation with bold extended brackets.  For instance in:   \left[ \frac{1}{2} \vec{\nabla} \times \vec{v} \right]   I want \left[ and \right] to be bold. I already tried  nothing is doing the trick.
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How do I typeset annuity and life-insurance symbols, actuarial notation in ConTeXt. I see there are packages available but not for ConTeXt.    Thanks
106017
Here is a formula: $\text{angle}=\arctan(dy/dx)$.  I can find an angle with my calculator for any value except $dx=0$.  My question is: is there no angle or, is there something that says when $dx=0$ the angle is found differently?
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I'm trying to express a complicated mathematical expression involving the summation of two matrices. One matrix contains a summation with a condition ("a=0 or b=1"), which I'm expressing underneath the Sum symbol using the "substack" approach, as suggested in:   Unfortunately, this causes the matrix bracket top and bottoms to misalign, as shown:    It would look better if this was not the case.  Can this be fixed please?  My MWE is:  \documentclass[10pt,a4paper]{article} \usepackage[latin1]{inputenc} \usepackage{amsmath} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{graphicx}  \begin{document} Minimum working example:  \begin{equation*} \dfrac{\mathrm{d}y}{\mathrm{d}x} =  \begin{bmatrix} -\sum_{i=1}^{a} A &amp; \cdots &amp; B \\ \vdots  &amp; \ddots  &amp; \vdots  \\ B &amp; \cdots &amp; -\sum_{i=1}^{a} A \end{bmatrix} + \begin{bmatrix} \sum_{\substack{         a,b,c,d \\         a=0~\mathrm{or}~b=1 }}  A_{ijkl} - \sum_{\substack{         a,b,c,d \\ a=0~\mathrm{or}~b=1 }}  B_{ijkl} \\ \vdots\\ \sum_{\substack{         a,b,c,d \\ a=0~\mathrm{or}~b=1 }}  C_{ijkl} - \sum_{\substack{         a,b,c,d \\ a=0~\mathrm{or}~b=1 }}  D_{ijkl} \end{bmatrix} \end{equation*}  \end{document}
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I would like to use bold symbols in superscript equations. To do so, I use \displaystyle as in   \documentclass{standalone} \usepackage{amsmath} \begin{document}     $e^{\mathbf{A}t}=e^{\displaystyle \mathbf{A}t}=e^{{\displaystyle \mathbf{A}}t}$ \end{document}   The corresponding output is:    The first exponential is exactly what I'm looking for.  Now, if I add the cmbright package, the corresponding code  \documentclass{standalone} \usepackage{amsmath} \usepackage{cmbright} \begin{document}     $e^{\mathbf{A}t}=e^{\displaystyle \mathbf{A}t}=e^{{\displaystyle \mathbf{A}}t}$ \end{document}   yields:    As one can see, in the left exponential the A symbol is not bold, and the other symbols are larger (as expected with \displaystyle).  I guess there is a pretty simple explanation about cmbright but I am not aware of it. Any clues to get the bold symbol AND the normal size with cmbright?
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I'm pretty new to Latex, so please bare with me.  I'm trying to add this notation to my document:      I created the above picture from the , but it seems that when I try to apply the same code in my editor (TeXstudio), things are different...    For example, the above picture was produced using the code:    D=\left\{ x\in\mathbb{N}|1\leq x\leq 100 \right\}    But when I write it in my editor (enclosed in the $ sign of course), I get the following error when compiling:      Undefined control sequence. $D=\left{x\in \mathbb   The funny thing is that I was still able to see the output in the preview window (even though the editor shows that this line has error in it). That's the first problem.  The second problem is, although I can see the output in the preview window, it won't be the same as the output I get from the Online Latex Equation Editor. While the Online Latex Equation Editor produces this:      My TeXstudio editor produces this:     Notice the distinction in the N symbol that denotes the set of natural numbers. It is different the what I intended, which is the first version, as it produced by the Online Latex Equation Editor.   What's wrong here? Am I missing a package or something?
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Please help me to draw the following diagram:  \begin{displaymath} \xymatrix{ H\ar[r]&amp;H .1={}_HI_Q\supset 1.Q&amp;Q\ar[l]_\epsilon^{\cong}  \\  &amp;R\ar[u]\ar[r]&amp;R\ar[u] } \end{displaymath}
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\documentclass [12pt]{article} \oddsidemargin=0pt \topmargin=0pt \textwidth=6.5in \textheight=8.5in \begin{document} \begin{center} {\large\bf\LaTeX\ Example 8} \end{center} Sometimes we have to typeset a sequence of calculations: \begin{align} \sum_{r=1}^k\left( l(r)-l(r-1)\right)  &amp;= \sum_{r=1}^k\left(N-2r+1\right) \\  &amp;= k(N+1)-2\sum_{r=1}^kr \\  &amp;= k(N+1)-k(k+1) \\  &amp;= k(N-k)  \end{align} \begin{quote} \begin{verbatim} \begin{align} \sum_{r=1}^k\left( l(r)-l(r-1)\right)  &amp;= \sum_{r=1}^k\left(N-2r+1\right) \\  &amp;= k(N+1)-2\sum_{r=1}^kr \\  &amp;= k(N+1)-k(k+1) \\  &amp;= k(N-k)  \end{align} \end{verbatim} \end{quote} Here is another way: \begin{eqnarray*}  \sum_{r=1}^k\left(l(r)-l(r-1)\right)  &amp;=&amp; \sum_{r=1}^k\left(N-2r+1\right) \\  &amp;=&amp; k(N+1)-2\sum_{r=1}^kr \\  &amp;=&amp; k(N+1)-k(k+1) \\ &amp;=&amp; k(N-k)  \end{eqnarray*} \begin{quote} \begin{verbatim} \begin{eqnarray*}  \sum_{r=1}^k\left(l(r)-l(r-1)\right)  &amp;=&amp; \sum_{r=1}^k\left(N-2r+1\right) \\  &amp;=&amp; k(N+1)-2\sum_{r=1}^kr \\  &amp;=&amp; k(N+1)-k(k+1) \\ &amp;=&amp; k(N-k)  \end{eqnarray*} Observations: \begin{itemize} \item The eqnarray environment is a displayed array with three columns.  It is aligned on the center column. \item The \verb+*+ supresses the generation of equation numbers. \end {itemize} ---Britney Wiggins \end{document}
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I am having a tough time reproducing the following equation in LaTeX:     C =  2/(ω^2 N^(2 )µπa)   This is the code I have:  C = \frac{2}{\omega^2N^2\mu\pia}   However, this throws an error. What am I doing wrong?
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I prefer to use bm package to bold math. However, I noticed that when used with eulervm, this gives inconsistent results for ‘&lt;’ and ‘>’ characters.  I wonder what causes it and can the usage bm be fixed to get proper ‘&lt;’.  \documentclass{article}  \usepackage[utf8]{inputenc} \usepackage[T1]{fontenc}  %\usepackage{amsmath}  \usepackage[euler-digits,euler-hat-accent]{eulervm}  \usepackage{bm}  \begin{document}      \texttt{\hphantom{mathbold}\llap{bm}}: \quad $ 1 + 1 &lt; 3; \quad \bm{1 + 1 &lt; 3} $      \texttt{mathbold}: \quad $ 1 + 1 &lt; 3; \quad \mathbold{1 + 1 &lt; 3} $  \end{document}
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I need a way of encoding the geometry line symbol. $\overline{AB}$ gives me the line segment symbol and $\overrightarrow{AB}$ gives me the ray symbol, I need a way to get a bar over the letters that has arrows on both ends. $\overrightleftarrow{AB}$ does not work.   Thanks!
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Typing \frac{W+W^*}{2} gives a fraction in which the denominator appears to the eye to be in the wrong position. Is there a way to correct this, i.e. place the 2 in under the + (without using arbitrary negative spacing)?
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I wish to use the symbol as in the following picture, however, I can not find it. Can someone help me?
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% What to do here   \begin{document}   This is good integration.   $$\displaystyle \int x dx = \frac{x^2}{2}$$  \end{document}    I don't know much about LaTeX so I am going to need some spoon feeding.   I want text to appear in normal font. But math to appear in AMSEuler Font.  I don't want to make any changes inside the document.