Please, how can I typeset the equation in the attached picture.
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3Welcome to TeX.SE! You make it easier to help people if you give some code, showing your tries. In this case I'd look at the mathtools manual. Look for cases, matrices and paired delimiters.– mickepCommented Mar 10, 2022 at 7:38
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@Tee I have given a point of departure only because I do not want to redo all the typing.– DenisCommented Mar 10, 2022 at 8:21
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@Denis thank you– TeeCommented Mar 11, 2022 at 3:31
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2 Answers
I'd like to suggest that you load the mathtools package for its dcases* environment and \coloneqq macro. And, do use bmatrix environments for the column vectors that are encased in square brackets.
\documentclass{article}
\usepackage{mathtools} % for dcases* env. and \coloneqq macro
\begin{document}
\[
G_{\chi}(\eta) \coloneqq
\begin{dcases*}
\bigl(
[T_{u,1}^*, T_{u,2}^*],\tau_y,0,\eta_c
\bigr)
& if $\tau_u=0$ and $\tau_y>0$ \\[\jot]
\bigl(
\tau_u,[T_{y,1}^*, T_{y,2}^*],0,F_c^s(\eta)
\bigr)
& if $\tau_u>0$ and $\tau_y=0$ \\[\jot]
\left\{
\begin{bmatrix}
[T_{u,1}^*, T_{u,2}^*] \\ \tau_y \\ 0 \\ \eta_c
\end{bmatrix},
\begin{bmatrix}
\tau_u \\ [T_{y,1}^*, T_{y,2}^*] \\ 0 \\F_c^s(\eta)
\end{bmatrix}
\right\}
& if $\tau_u=0$ and $\tau_y=0$
\end{dcases*}
\]
\end{document}
A point of departure could be
\documentclass[12pt]{article}
\usepackage{amsmath}
\begin{document}
\begin{equation*}
X =
\begin{cases}
\begin{Bmatrix}
\begin{bmatrix}
a & b\\
c & d
\end{bmatrix}
,
\begin{bmatrix}
A & B\\
D & C
\end{bmatrix}
\end{Bmatrix}
& \text{if $x=p$} \\
0 & \text{otherwise}
\end{cases}
\end{equation*}
\end{document}
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3Small suggestion: write
\text{if $x=p$}, semanticallyif $x=p$is the entire comment. If writing it this way one can also avoid situations like\text{if } x=p \text{ and } y>0and instead write the straight forward\text{if $x=p$ and $y>0$}– daleifCommented Mar 10, 2022 at 8:10 -
1@daleif Thanks for the suggestion. I am implementing it in my proto-answer.– DenisCommented Mar 10, 2022 at 8:13