It looks like Kotobee includes an editor for "Global JS" and so it may be possible to inject Mathjax support into particular documents with the script element
<script src='https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML'></script>
Then we would use the raw CSS/HTML editing context to enter the necessary mathjax markup.
Or, if we had a Markdown editor with post-processing support for latex, we could write mathematical content like this:
## The Model The model is a set of incomes over time expressed as monetary values that represent the accrual of benefits over time from adoption or pursuit of the proposed enterprise together with a set of expenses over time also expressed as monetary values that represent the payment of costs over time to continue or adopt the proposed enterprise. ~~$$M\equiv \left\{ c,q,p,R,I,n,E,m \right\}$$ {#eq:model} ~~$$\begin{split}c = &\text{cost of capital} \\ ~~ &\text{at the time of decision}\end{split}$$ ~~$$\begin{split}q = &\text{the organization's required rate of return} \\ ~~&\text{at the time of decision}\end{split}$$ ~~$$p = \text{periods of calendar intervals within span of enterprise}$$ ~~$$n = \text{number of income streams}$$ ~~$$m = \text{number of expense streams}$$ ~~$${ R }_{ n+m,p }=\left\{ \begin{matrix} { r }_{ 1,1 } & \cdots & { r }_{ 1,p } \\ ~~\vdots & \ddots & \vdots \\ ~~{ r }_{ n+m,1 } & \cdots & { r }_{ n+m,p } \\ ~~\end{matrix} \right\}$$ ~~$$\begin{split}{ r }_{ i,j }= &\text{interest rate paid to borrow}
Michael
Viele Grüße,
M.
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