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20

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10

Here's my rule of thumb for being on-topic: Can this Question be resolved by reasoned mathematical argument? Your post (on main Math.SE) ends with the following words: So what am I doing wrong? Do I need to store it as a float so that all the digits are right of the decimal point? Do I need a special library (like Brobdingnag in R) to handle ...


8

This more-or-less summarizes some of the stuff which has already been said in the comments. If I understood correctly, the OP is asking about getting indices above/below the sign for integral or sum. I hope this answers the question at least partially. Probably the best thing to do is to show some examples: In the inline mode we can write $\sum_{n=0}^\...


7

The following: $$\left.\begin{array}{c} 5\\ 6 \end{array} \right] \quad 2\quad \left[\begin{array}{c} 1\\ 2 \end{array}\right.$$ is produced by $$\left.\begin{array}{c} 5\\ 6 \end{array} \right] \quad 2\quad \left[\begin{array}{c} 1\\ 2 \end{array}\right.$$ You can make the number smaller and/or add space by including blank lines, e.g. $$\left.\begin{...


5

It isn't pretty, but: $$ \left. \begin{matrix} 5\\[5ex] 6 \end{matrix} \right] \begin{matrix} \\ 2 \\ \\ \end{matrix} \left[ \begin{matrix} 1 \\[5ex] 2 \end{matrix} \right. $$ $$ \left. \begin{matrix} 5\\[5ex] 6 \end{matrix} \right] \begin{matrix} \\ 2 \\ \\ \end{matrix} \left[ \begin{matrix} 1 \\[5ex] 2 \end{matrix} \right. $$


4

In order to get the preferred notation in accordance with ISO 80000-2, use $$\sum\limits_{i = 1}^n {a_i}$$ $$\sum\limits_{i = 1}^n {a_i}$$ However, the following notations are also used $$\sum\nolimits_{i = 1}^n {a_i}$$ $$\sum\limits_i {a_i}$$ $$\sum\nolimits_i {a_i}$$ $$\sum {a_i}$$ $$\sum\nolimits_{i = 1}^n {a_i}$$ $$\sum\limits_i {a_i}$$ $$\sum\...


3

Kindly, don't hide my this legal inquiry like so many other topics of mine that had been hidden in so many mathematical sections at SE where not a single convincing reason was provided by all the moderators who deliberately have hidden so many other true proven discoveries of mine and since many years as well Nobody has hidden any true discoveries of yours. ...


1

To make my comments into an answer: Firstly, you can define it manually, so \operatorname{sech}(x) renders as $\operatorname{sech}(x)$. A more fancy way is to put \DeclareMathOperator{\sech}{sech} somewhere in your post, and then \sech will work everywhere in the post. For example, I'll declare the operator (invisibly) here: $\DeclareMathOperator{\sech}{...


1

Markov Chains This is a heuristic solution for coding Markov chains in Mathjax using a combination of commutative diagrams, the encircle tool and font sizes. There are a few minor issues with this method, for instance the arrows' ends should be attached closer to their targets. Also, it lacks double-headed diagonal arrows and it is difficult to attach ...


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