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How do i write this in latex plz

enter image description here

Kaung Htet
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    welcome to TEXSE, what have to tried so-far? Because, please note that this is not a just-do-it-for-me site. – Raaja_is_at_topanswers.xyz Aug 05 '19 at 15:26
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    Pls ask only one substantive question per posting. – Mico Aug 05 '19 at 15:35
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    Although I answered, you should look symbols up here first: https://tex.stackexchange.com/questions/14/how-to-look-up-a-symbol-or-identify-a-math-symbol-or-character – Davislor Aug 05 '19 at 19:53
  • As an alternative to the equal with the upper-case delta above it, you may like to use an equal with "def" above it. This is given by the macro \eqdef from package mismath. – murray Aug 05 '19 at 20:43
  • And see also: https://tex.stackexchange.com/questions/12537/how-can-i-make-a-horizontal-dashed-line – Davislor Aug 06 '19 at 19:40

2 Answers2

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In Unicode, ≜ is U+225C. This symbol is \triangleq in amssymb, unicode-math and many other packages.

Davislor
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You can use

\begin{equation*}
    w \overset{\Delta}{=}
    \begin{bmatrix}
        w^1\\
        \verb!---!\\
        w^2
    \end{bmatrix}
    \overset{\Delta}{=}
    \begin{bmatrix}
        p\\
        \verb!-------------!\\
        [exp(q_n/\pi)]r^3
    \end{bmatrix}
\end{equation*}

to render

enter image description here

\overset places the first argument over the second argument and \verb renders out exactly what its argument is in code form (kind of like the difference between code and text in Stack Exchange!).

Please note that both overset and the bmatrix environment are provided by the amsmath package, so make sure to add \usepackage{amsmath} to your preamble.

Shady Puck
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    The next time can you put, please, the full code? And exp has a command \exp in roman into math-mode: https://tex.stackexchange.com/questions/254785/e-vs-exp-in-display-mode.+1 for me – Sebastiano Aug 05 '19 at 22:04