Large delimiters, multiline equations

[Daniel]

On 2021-01-22 14:28, Neal Becker wrote:
> I have an equation that has to be split (to fit into beamer
> presentation).  It has large delimiters that span the lines.  Does lyx
> have any facility to help with this?  I did get a useable result, but
> only with a lot of ERT.  Lyx seems not helpful here, is there any way
> other than ERT to get "\Biggl. ... \Biggr]"?  Or "\right."?
> 
> Here is what I wanted:
> 
> \begin{multline*}
> 
> \mathbf{X}_{N_{C}\times S\times
> A}=\left[\left[\left[\sum_{n}m1_{p+cL_{c}+nS}m2_{p+cL_{c}+(n+\tau)S}^{*}\right.\right.\right.,\\
> 
> \Biggl.\Biggl.\Biggl.\tau\in[-A/2\dots A/2]\Biggr],p\in[0\dots
> S-1]\Biggr],c\in[0\dots N_{c}-1]\Biggr]
> 
> \end{multline*}

When I copy and paste your LaTeX code via

Paste Special > Paste from LaTeX

it seems to work without ERT. There is still not so prety "Biggl" text 
in LyX's work area though...

Daniel