±±¾©Ê¯ÓÍ»¯¹¤Ñ§Ôº2026ÄêÑо¿ÉúÕÐÉú½ÓÊÕµ÷¼Á¹«¸æ
²é¿´: 793  |  »Ø¸´: 4
µ±Ç°Ö»ÏÔʾÂú×ãÖ¸¶¨Ìõ¼þµÄ»ØÌû£¬µã»÷ÕâÀï²é¿´±¾»°ÌâµÄËùÓлØÌû

ÁõС¾üÏÈÉú

½ð³æ (СÓÐÃûÆø)

Ê®Îå»­Éú

[ÇóÖú] Ö¤Ã÷Ò»Ìâ

AºÍB¾ùÊÇn½×Õý¶¨¾ØÕó,Ö¤Ã÷ABÊÇÕý¶¨¾ØÕóµÄ³ä·Ö±ØÒªÌõ¼þÊÇAB=BA

[ ·¢×ÔÊÖ»ú°æ http://muchong.com/3g ]
»Ø¸´´ËÂ¥

» ²ÂÄãϲ»¶

²»¼ìÊø£¬ÐÄÈÕí§ËÁ;²»·Ü·¢£¬ÐÄÈÕÍÇÃÒ¡£
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

junefi

Ìú¸Ëľ³æ (ÕýʽдÊÖ)

ÒýÓûØÌû:
3Â¥: Originally posted by math2000 at 2012-12-23 18:06:50
ABÊÇÕý¶¨¾ØÕó<=>AB¶Ô³Æ£¬ÇÒ¶ÔÈÎÒâ·ÇÁãÏòÁ¿x£¬ÓÐ x^T*(AB)*x > 0
ÒòΪÒÑÖªA£¬BÊÇÕý¶¨µÄ£¬ËùÒÔ¶ÔÈÎÒâ·ÇÁãÏòÁ¿x£¬ÓÐ x^T*A*x>0, x^T*B*x > 0
ËùÒÔÓÐ
x^T*A*x * x^T*B*x =(||x||^2)* x^T*(AB)*x  &g ...

x^T*A*x * x^T*B*xÊÇ·ñµÈÓÚ(||x||^2)* x^T*(AB)*x£¿
ÀíÂ۸ıäÊÀ½ç£¡
4Â¥2012-12-28 00:02:09
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
²é¿´È«²¿ 5 ¸ö»Ø´ð

11jxli1

½û³æ (ÖøÃûдÊÖ)

¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
±¾ÌûÄÚÈݱ»ÆÁ±Î

2Â¥2012-12-23 12:35:52
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

math2000

Ìú¸Ëľ³æ (Ö°Òµ×÷¼Ò)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
ABÊÇÕý¶¨¾ØÕó<=>AB¶Ô³Æ£¬ÇÒ¶ÔÈÎÒâ·ÇÁãÏòÁ¿x£¬ÓÐ x^T*(AB)*x > 0
ÒòΪÒÑÖªA£¬BÊÇÕý¶¨µÄ£¬ËùÒÔ¶ÔÈÎÒâ·ÇÁãÏòÁ¿x£¬ÓÐ x^T*A*x>0, x^T*B*x > 0
ËùÒÔÓÐ
x^T*A*x * x^T*B*x =(||x||^2)* x^T*(AB)*x  >0
ÓÉ´Ë¿ÉÖª£¬Ö»ÒªÖ¤ ABÊÇÕý¶¨¾ØÕó<=>AB¶Ô³Æ ¼´¿É
¶ø AB¶Ô³Æ <=>(AB)^T=AB <=>BA =AB
3Â¥2012-12-23 18:06:50
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

Pchief

Ìú¸Ëľ³æ (ÕýʽдÊÖ)

5Â¥2012-12-28 18:37:43
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
×î¾ßÈËÆøÈÈÌûÍÆ¼ö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[¿¼ÑÐ] 266Çóµ÷¼Á +7 ÑôÑôÍÛÈû 2026-03-27 8/400 2026-03-27 13:04 by zzll406
[¿¼ÑÐ] 085701»·¾³¹¤³Ì£¬267Çóµ÷¼Á +7 minht 2026-03-26 7/350 2026-03-27 11:56 by zzll406
[¿¼ÑÐ] Çóµ÷¼ÁÍÆ¼ö ²ÄÁÏ 304 +10 ºÉ°üµ°hyj 2026-03-26 10/500 2026-03-27 11:51 by ÅÁ¶ûÂíÀ­ÌØ
[¿¼ÑÐ] 334Çóµ÷¼Á +3 ÓêÇåÌìÇç 2026-03-21 3/150 2026-03-27 11:30 by ²»³Ôô~µÄ؈
[¿¼ÑÐ] 286Çóµ÷¼Á +4 lim0922 2026-03-26 4/200 2026-03-27 10:28 by guoweigw
[˶²©¼ÒÔ°] ±±¾©ÁÖÒµ´óѧ˶µ¼ÕÐÉú¹ã¸æ +6 kongweilin 2026-03-26 8/400 2026-03-27 10:18 by FF_16
[¿¼ÑÐ] Ò»Ö¾Ô¸211ԺУ 344·Ö ¶«±±Å©Òµ´óѧÉúÎïѧѧ˶£¬Çóµ÷¼Á +5 ؼ·çѩҹ¹éÈËØ¼ 2026-03-26 6/300 2026-03-27 10:15 by barness
[¿¼ÑÐ] 276Çóµ÷¼Á¡£ÓаëÄêµç³ØºÍ°ëÄê¸ß·Ö×Óʵϰ¾­Àú +10 ²ÄÁÏѧ257Çóµ÷¼Á 2026-03-23 11/550 2026-03-27 10:13 by YCIT- LHL
[¿¼ÑÐ] 081200-11408-276ѧ˶Çóµ÷¼Á +3 ´Þwj 2026-03-26 3/150 2026-03-27 07:58 by chemisry
[¿¼ÑÐ] 321Çóµ÷¼Á +6 wasdssaa 2026-03-26 6/300 2026-03-26 20:57 by sanrepian
[¿¼ÑÐ] ѧ˶274Çóµ÷¼Á +3 LiÀîÓã 2026-03-26 3/150 2026-03-26 18:32 by Ìá³ö·½·¨µÄÌá³öº
[¿¼ÑÐ] ²ÄÁÏ¿¼ÑÐÇóµ÷¼Á +3 Dendel 2026-03-23 6/300 2026-03-26 17:51 by fmesaito
[¿¼ÑÐ] 334·Ö Ò»Ö¾Ô¸ÎäÀí-080500 ²ÄÁÏÇóµ÷¼Á +4 ÀîÀî²»·þÊä 2026-03-25 4/200 2026-03-25 21:26 by ÐÇ¿ÕÐÇÔÂ
[¿¼ÑÐ] ÇóbÇøÔºÐ£µ÷¼Á +4 ÖÜ56 2026-03-24 5/250 2026-03-25 17:12 by yishunmin
[¿¼ÑÐ] ²ÄÁÏר˶331Çóµ÷¼Á +4 Ïʵ±Å£ 2026-03-24 4/200 2026-03-24 15:58 by JourneyLucky
[¿¼ÑÐ] 335Çóµ÷¼Á +4 yuyuÓî 2026-03-23 5/250 2026-03-23 23:49 by Txy@872106
[¿¼ÑÐ] 308Çóµ÷¼Á +3 īīĮ 2026-03-21 3/150 2026-03-22 16:54 by i_cooler
[¿¼ÑÐ] 306Çóµ÷¼Á +5 À´ºÃÔËÀ´À´À´ 2026-03-22 5/250 2026-03-22 16:17 by BruceLiu320
[¿¼ÑÐ] Ò»Ö¾Ô¸¶«»ª´óѧ¿ØÖÆÑ§Ë¶320Çóµ÷¼Á +3 Grand777 2026-03-21 3/150 2026-03-21 19:23 by ¼òÖ®-
[¿¼ÑÐ] 0703»¯Ñ§µ÷¼Á +4 ÄÝÄÝninicgb 2026-03-21 4/200 2026-03-21 18:39 by ѧԱ8dgXkO
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û