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(525-813) 85-37 Jukjung, Hakgyo, Hampyung,Chonnam, Korea TEL: 061-323-9000/ FAX: 061-322-9888 / E-Mail: [email protected] Copyright(c) 2010 YJC CO.,Ltd.

InR, deflne (a) d 1 ( x;y ) = ( x¡y ) 2, (b) d 2 ( x;y ) = p jx¡yj , (c) d 3 ( x;y ) = jx 2 ¡y 2 j , (d) d 4 ( x;y ) = jx¡ 2 yj , (e) d 5 ( x;y ) = jx¡yj 1+ jx¡yj.

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