±±¾©Ê¯ÓÍ»¯¹¤Ñ§Ôº2026ÄêÑо¿ÉúÕÐÉú½ÓÊÕµ÷¼Á¹«¸æ
²é¿´: 1910  |  »Ø¸´: 1
±¾Ìû²úÉú 1 ¸ö ·­ÒëEPI £¬µã»÷ÕâÀï½øÐв鿴

°Ë½ÇÕ¯

Òø³æ (ÖøÃûдÊÖ)

[ÇóÖú] ÇëÎÊ£º identically zero ÊÇʲôÒâË¼ÄØ£¬Ð»Ð»¡£

The curvature is identically zero and the curvature tensor is not identically zero.
·­Ò룺ÇúÂÊÊÇidentically zero£¬ ÇúÂÊÕÅÁ¿²»identically zero¡£

» ²ÂÄãϲ»¶

ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

phu_grassman

ÈÙÓþ°æÖ÷ (ÖªÃû×÷¼Ò)

¿ìÀÖµº¡¢²¼¼ªµºµºÖ÷

ÓÅÐã°æÖ÷

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¡ï ¡ï ¡ï ¡ï ¡ï ¡ï
RXMCDM: ½ð±Ò+1, ¶àлӦÖú£¡ 2014-11-24 01:49:50
°Ë½ÇÕ¯: ½ð±Ò+5, ·­ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸, ·Ç³£¸Ðл¡£ 2014-11-24 20:55:31
¡°ºãΪÁ㡱µÄÒâ˼¡£
2Â¥2014-11-23 17:46:29
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
Ïà¹Ø°æ¿éÌø×ª ÎÒÒª¶©ÔÄÂ¥Ö÷ °Ë½ÇÕ¯ µÄÖ÷Ìâ¸üÐÂ
×î¾ßÈËÆøÈÈÌûÍÆ¼ö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[¿¼ÑÐ] 283Çóµ÷¼Á +11 A child 2026-04-04 11/550 2026-04-06 23:05 by chenzhimin
[¿¼ÑÐ] 288Çóµ÷¼Á +9 ûÓдð°¸_ 2026-04-05 9/450 2026-04-06 22:45 by chenzhimin
[¿¼ÑÐ] 085600²ÄÁÏÓ뻯¹¤×¨Ë¶329 Çóµ÷¼Á +11 ¶îcc 2026-04-06 11/550 2026-04-06 22:33 by chenzhimin
[¿¼ÑÐ] 266Çóµ÷¼Á +19 ÑôÑôÍÛÈû 2026-04-01 19/950 2026-04-06 15:47 by lin-da
[¿¼ÑÐ] 081700£¬311£¬Çóµ÷¼Á +16 ¶¬Ê®Èý 2026-04-04 17/850 2026-04-06 14:56 by ÉÐË®¸óÖ÷
[¿¼ÑÐ] Ò»Ö¾Ô¸Î人Àí¹¤´óѧ080200»úе¹¤³Ì308·Ö£¬Çóµ÷¼Á +4 ÖÕ²»ËÆ´Óǰ 2026-04-05 4/200 2026-04-06 11:46 by ¿¼ÑÐѧУÕеãÈË
[¿¼ÑÐ] Çóµ÷¼Á +5 wos666 2026-04-03 5/250 2026-04-06 10:13 by À¶ÔÆË¼Óê
[¿¼ÑÐ] ¿¼Ñе÷¼ÁÉúѰÕÒµ¼Ê¦ +3 ¹ËÕ°¿¼Ñа¡ 2026-04-05 3/150 2026-04-05 18:18 by à£à£à£0119
[¿¼ÑÐ] ¹¤¿Æ08ר˶»úе275Çóµ÷¼Á +3 AaAa7420 2026-04-02 3/150 2026-04-05 13:26 by jp9609
[¿¼ÑÐ] 081700ѧ˶£¬323·Ö£¬Ò»Ö¾Ô¸Öйúº£Ñó´óѧÇóµ÷¼ÁѧУ +16 ÅûÐÇºÓ 2026-04-04 16/800 2026-04-05 11:27 by Öí»á·É
[¿¼ÑÐ] µ÷¼ÁÇóÖú +10 Ïë»»ÊÖ»ú²»Ïë½âÊ 2026-04-02 13/650 2026-04-05 09:41 by sam3303
[¿¼ÑÐ] 294Çóµ÷¼Á +6 Grey_Ey 2026-04-02 9/450 2026-04-04 22:07 by hemengdong
[¿¼ÑÐ] ²ÄÁϵ÷¼Á +12 Ò»ÑùYWY 2026-04-02 13/650 2026-04-04 20:49 by À¶ÔÆË¼Óê
[¿¼ÑÐ] 292Çóµ÷¼Á +11 2022080213 2026-04-04 13/650 2026-04-04 18:38 by macy2011
[¿¼ÑÐ] ¿¼Ñе÷¼Á +8 ²»°®ºÈÒûÁÏ 2026-04-03 8/400 2026-04-03 16:40 by Mistake-J
[¿¼ÑÐ] ¹¤¿Æ 267Çóµ÷¼Á +5 wanwan00 2026-04-02 7/350 2026-04-03 14:14 by zhangdingwa
[¿¼ÑÐ] 346Çóµ÷¼Á +5 Ö£³ÏÀÖ 2026-04-02 5/250 2026-04-02 16:38 by SZW_UJN
[¿¼ÑÐ] 321Çóµ÷¼Á Ò»Ö¾Ô¸ Õã½­¹¤Òµ´óѧÉúÎïÒ½Ò© +5 ºÙºÙHC 2026-04-01 6/300 2026-04-02 15:23 by sophie2180
[¿¼ÑÐ] »·¾³¹¤³Ìµ÷¼Á +9 hyzzzzzzz. 2026-04-01 9/450 2026-04-01 14:20 by salamander`
[¿¼ÑÐ] ½­ËÕËÕ±±¸ßУ³ÏÑûµ÷¼Áͬѧ +3 zzll406 2026-03-31 3/150 2026-03-31 16:54 by ¼°Ê±ÐÐÀÖfan
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û