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ilovexiaomu

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¡ï
ÓàÔó³É(½ð±Ò+1): лл²ÎÓëÓ¦Öú£¡ 2011-08-31 21:41:18
wzhÉÏÉÆÈôË®(½ð±Ò+1): 2011-09-02 09:09:02
wzhÉÏÉÆÈôË®(½ð±Ò+1): 2011-12-20 09:34:49
¿ÉÒÔ²éÔÄÏ£¬deltaº¯ÊýµÄ»ý·ÖÐÔÖÊ£¬¾Í¿ÉÒÔ»ý·ÖÁË£¬ºÃÏñÊÇf(x)*Delta(x)=f(0),
»¹ÓÐºÜ¶à¹ØÓÚÕâ·½ÃæµÄÐÔÖʵÄ
2Â¥2011-08-31 16:05:38
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

wangww2011

ľ³æ (ÖøÃûдÊÖ)

¡ï ¡ï
ÓàÔó³É(½ð±Ò+2): лл²ÎÓëÓ¦Öú£¡ 2011-08-31 21:41:31
˵ʵ»° ´ó¼Ò¿´µ½deltaº¯Êý»ý·Ö¾Í¸ßÐË ²»¹ý»¹ÊÇÓÃmathematicaÑÝʾһϰÉ
CODE:
A[omega_] =
  1/2 (1 - epsilon/Ep) DiracDelta[omega + Ep] +
   1/2 (1 + epsilon/Ep) DiracDelta[omega - Ep];
Assuming[Ep > 0, Integrate[A[x], {x, -Infinity, 0}]]

½á¹û
CODE:
(Ep - epsilon)/(2 Ep)

3Â¥2011-08-31 17:46:17
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

markh

Òø³æ (³õÈëÎÄ̳)

ÒýÓûØÌû:
3Â¥: Originally posted by wangww2011 at 2011-08-31 17:46:17:
˵ʵ»° ´ó¼Ò¿´µ½deltaº¯Êý»ý·Ö¾Í¸ßÐË ²»¹ý»¹ÊÇÓÃmathematicaÑÝʾһϰÉ
[code]
A[omega_] =
  1/2 (1 - epsilon/Ep) DiracDelta[omega + Ep] +
   1/2 (1 + epsilon/Ep) DiracDelta[omega - Ep];
Assuming ...

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4Â¥2011-11-02 01:35:39
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