テスト のバックアップソース(No.5)

* 例1 [#e94ee235]

 #tex{{
 \bm{A}(x,y,z)=A_x(x,y,z)\bm{i}+A_y(x,y,z)\bm{j}+A_z(x,y,z)\bm{k}
 }}

#tex{{
\bm{A}(x,y,z)=A_x(x,y,z)\bm{i}+A_y(x,y,z)\bm{j}+A_z(x,y,z)\bm{k}
}}

* 例2 [#fd05fd4f]

 #tex{{
 \mathrm{grad} \phi
 &= \nabla\phi\\ 	   
 &= \left(\bm{i}\frac{\partial}{\partial x}+ \bm{j}\frac{\partial}{\partial   y}+\bm{k}\frac{\partial}{\partial z}\right)\phi\\
 &= \frac{\partial\phi}{\partial x}\bm{i}+ \frac{\partial\phi}{\partial  y}\bm{j}+\frac{\partial\phi}{\partial z}\bm{k}
 }}

#tex{{
\mathrm{grad} \phi
&= \nabla\phi\\ 	   
&= \left(\bm{i}\frac{\partial}{\partial x}+ \bm{j}\frac{\partial}{\partial y}+\bm{k}\frac{\partial}{\partial z}\right)\phi\\
&= \frac{\partial\phi}{\partial x}\bm{i}+ \frac{\partial\phi}{\partial y}\bm{j}+\frac{\partial\phi}{\partial z}\bm{k}
}}
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