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(a) $\ldots$ given by a PDS.   However, $\ldots$
(b) $\ldots$ given by a PDS\@. However, $\ldots$

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(b) $\ldots$ shown in Fig.~1.

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(a) pp.1-3
(b) pp.1--3

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(b) $s(x_1,\ldots,x_n)=x_1+\cdots+x_n$

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(b) $x=\langle a,b\rangle$
(b') $x=\left<a,b\right>$

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(a) $\{x| ||x||>0\}$
(b) $\{\,x\mid \|x\|>0\,\}$

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½ÄÀþ(|)¤ÏÀäÂÐÃÍ¡ÊÎ㤨¤Ð |x|¡Ë¤Ê¤É¤òɽ¤¹µ­¹æ¤Ç¤¹¡£¤³¤ÎÎã¤Î¤è¤¦¤Ê¡¢½¸¹ç¤ÎÄêµÁÃæ¤Î¶èÀÚ¤êÀþ¤Ï¡¢´Ø·¸±é»»»Ò¤Ç¤¢¤ë \mid ¤ò»È¤Ã¤Æ½ñ¤­¤Þ¤¹¡£¤Þ¤¿¡¢Æó½Å½ÄÀþ¤ò½ñ¤­¤¿¤¤¤È¤­¤Ï¡¢|| ¤Ç¤Ï¤Ê¤¯ \| ¤ò»È¤¤¤Þ¤¹¡£|| ¤Ç¤Ï½ÄÀþ´Ö¤Î´Ö³Ö¤¬¹­¤¹¤®¤Æ¡¢´Ö±ä¤Ó¤·¤Æ¤·¤Þ¤¤¤Þ¤¹¡£\, ¤ÏºÙ¤¤¶õÇò¤òÃÖ¤¯Ì¿Îá¤Ç¤¹¡£½ÄÀþ¤ò»È¤Ã¤¿½¸¹ç¤ÎÄêµÁ¡ÊÆâÊñŪÄêµÁ¡Ë¤ò½ñ¤¯¤È¤­¤Ï¡¢Ãæ³ç¸Ì¤ÎÆ⦤˺٤¤¶õÇò¤òÃÖ¤¯¤Î¤¬¤è¤¤¤½¤¦¤Ç¤¹¡ÊTeXbook [K89, p.239] ¤è¤ê¡Ë¡£

(a) $|-x|=|+x|$
(b) $\left|-x\right|=\left|+x\right|$

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[K89, p.235] ¤ËºÜ¤Ã¤Æ¤¤¤ëÎ㡣ñ¤Ë½ÄÀþ¤ò½ñ¤¤¤¿¾ì¹ç¡¢¤½¤ì¤Ï¡ÖÉáÄ̤ε­¹æ¡×¤È¤·¤Æ°·¤ï¤ì¤Þ¤¹¡£¤½¤Î¤¿¤á¡¢Îã(a)¤Ç¤Ï¡¢TeX¤Ï¡Ö | ¤«¤é x| ¤ò¸º¤¸¤¿¤â¤Î¤È | ¤Ë x| ¤ò²Ã¤¨¤¿¤â¤Î¤¬Åù¤·¤¤¡×¤È²ò¼á¤·¡¢Í¾Ê¬¤Ê¶õÇò¤òÁÞÆþ¤·¤Æ¤·¤Þ¤¤¤Þ¤¹¡£ÉáÄ̤ε­¹æ¤Ç¤Ï¤Ê¤¯¶èÀڤ국¹æ¤Ç¤¢¤ë¤³¤È¤ò¼¨¤¹¤¿¤á¡¢\left \right ¤ò»È¤¦É¬Íפ¬¤¢¤ê¤Þ¤¹¡£

¶õÇò

(a) $y dx-x dy$
(b) $y\,dx-x\,dy$

(a) $g=9.8{\rm m/sec^2}$
(b) $g=9.8\,{\rm m/sec^2}$

(a) $k!n!(n+1)!$
(b) $k!\,n!\,(n+1)!$

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¤¤¤º¤ì¤â [K89, p.232] ¤è¤ê¡£ºÙ¤¤¶õÇò(\,)¤òÊ䤦¤Î¤¬Ë¾¤Þ¤·¤¤Îã¤Ç¤¹¡£dx ¤ä dy ¤ÎÁ°¡¢ÊªÍýñ°Ì¤ÎÁ°¡¢³¬¾èµ­¹æ( ! )¤È±Ñ¿ô»ú¤ä³«¤­³ç¸Ì¤Î´Ö¡¢¤Ë¤ÏºÙ¤¤¶õÇò¤òÃÖ¤¯¤Î¤¬¤è¤¤¤È½Ò¤Ù¤é¤ì¤Æ¤¤¤Þ¤¹¡£

(a) $\sqrt2 x$
(b) $\sqrt2\,x$

(a) $\Gamma_2+\Delta^2$
(b) $\Gamma_{\!2}+\Delta^{\!2}$

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[K89, p.233] ¤è¤ê¡£ºÙ¤¤¶õÇò¤òÃÖ¤¯¤Î¤¬Ë¾¤Þ¤·¤¤Îã¡¢¤ª¤è¤Ó¡¢µÕ¤ËÉé¤Î¶õÇò(\!)¤òÃÖ¤¤¤Æ´Ö³Ö¤òµÍ¤á¤¿¤Û¤¦¤¬¤è¤¤Îã¡¢¤Ç¤¹¡£¤³¤ì¤é¤Ï¡¢°ìÅÙÁÈÈǤò¤·¤Æ¤ß¤Æ¡¢ÉÔºÙ¹©¤Ë´¶¤¸¤¿¤é½¤Àµ¤¹¤ë¡¢¤È¤¤¤¦Êý¿Ë¤ÇÀ°¤¨¤ë¤Î¤¬¤è¤¤¤Ç¤·¤ç¤¦¡£

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[K89] D.E. Knuth, TeX¥Ö¥Ã¥¯, ²þÄû¿·ÈÇ, ºØÆ£¿®Ã˴ƽ¤, ºíë¹¥µ±Ìõ, ¥¢¥¹¥­¡¼, 1989.


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