ä¸æ¯ä¸ä¸ªæ°å¼ æ¯ä½ä¸ºä¸ä¸ªè¿ç®ç¬¦åºç°çæ们å¦çæ¶åä¸è¬å«åå¯é¡¿ç®åããåå¯é¡¿ç®å,æ°å¦ç¬¦å·ä¸ºâ½,读ä½Nabla.
ããâ½â¡i*d/dx+j*d/dy+k*d/dz
ããè¿ç®è§å:
ããâ½u=(i*d/dx+j*d/dy+k*d/dz)u=i*du/dx+j*du/dy+k*du/dz
ããâ½Â·A=(i*d/dx+j*d/dy+k*d/dz)·(Ax*i+Ay*j+Az*k)=dAx/dx+dAy/dy+dAz/dz
ããâ½ÃA=(dAz/dy-dAy/dz)*i+(dAx/dz-dAz/dx)*j+(dAy/dx-dAx/dy)*k
ããæ°éåºç梯度ä¸ç¢éåºçæ£åº¦åæ度å¯è¡¨ç¤ºä¸ºï¼
ããgradu=â½u,divA=â½Â·A,rotA=â½ÃA
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