Natija:
Biz bu erda tanlangan formulalar uchun harfalarni birbirga yaqin qilib
yozamiz.
\documentclass{article}
\usepackage{amsmath}
\begin{document}
$$
\begin{array}{l}
\frac{\ds\partial \varphi \left( {t,x} \right)}{\ds\partial t}=-\frac{\ds\partial
}{\ds\partial x}\left[ {\mu x\varphi \left( {t,x} \right)} \right]+\frac{\ds 1}{\ds
2}\frac{\ds\partial ^2}{\ds\partial x^2}\left[ {\sigma ^2x^2\varphi \left( {t,x}
\right)} \right],
\\
\left. {\varphi \left( {t,x} \right)} \right|_{t=0} =\varphi _0 \left( x
\right),\quad\left. {\varphi \left( {t,x} \right)} \right|_{x=\pm \infty } =0,
\end{array}
\eqno(4)
74
$$
\end{document}
Do'stlaringiz bilan baham: |