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(1)êÆ©ÛSK: 1 9 ± r\r http://math.nju.edu.cn/˜meijq kSK´7L3Š’þþ,gK‰Ð

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êÆ©ÛSK: 1 9 ±

r\r

http://math.nju.edu.cn/˜meijq 2007.4

: kSK´7L3Š’þþ,gK‰Ð Œ±‰·,

7L´î‚Õá¤.

SK:

1. x,y•þ˜mX þSÈ, x, yPX, y0. 3e¡Øª

xxty, xtyy¥0

¥-t xx, yy

xy, yy l y²Schwarzت. 2. y²SȘm÷vXe²1o>/úª:

}x y}2 }xy}22p}x}2 }y}2q, @ x, y.

3. apa1, a2,, anqPRn, r¡0,-

In txpx1, x2,, xnqPRn







|xiai|¤r, 1¤i¤nu,

¡n‘N.y²NÑ´48. rþª¥¤†¤ 8 Ü¡máN,y²§‚(´m8.

4. AÝþ˜m pX, ρqf8, 3AAþ½ÂXeNρA:

ρApa1, a2qρpa1, a2q, ρAAþÝþ,¡pÝþ.

5. Cauchy:XJkÂñf, KÙg´Âñ.

1

(2)

6. ,k‡;—8܃8Ú¿8E;—8Ü.

7. f : XÑY lÝþ˜mÝþ˜mN. ,

p1qf ëYN¿©7‡^‡´m8”„´m8;

p2qf ëYN¿©7‡^‡´48”„´48.

8. Þ~`²,lR2 RëYNؘ½r48N48(: Ę

¼êfpxqx1 ã”,¿•x¶ŠÝK).

9. ,Ø3lü  ±S1 RëYü(: fpxqfpxq,

xÚx¿ÄÎÒCz.)

10. äe4´Ä3, X3KOŽÑ5:

p1q lim

px,yqÑp0,0q

sin xy

a

x2 y2, p2q lim

px,yqÑp0,0q

x2y2 x2 y2,

p3q lim

px,yqÑp0,0qx2logpx2 y2q, p4q lim

px,yqÑp0,0q

x3 y3 x2 y .

11. äe4´Ä3, X3KOŽÑ5:

p1qlimxÑ8limyÑ8x2 y2

x2 y4, limyÑ8limxÑ8x2 y2 x2 y4,

p2qlimxÑ 8limyÑ0 xy

1 xy, limyÑ0limxÑ 8 xy 1 xy,

p3qlimxÑ8limyÑ8sin2x yπx , limyÑ8limxÑ8sin2x yπx ,

p4qlimxÑ0limyÑ8 1

xytan1xyxy, limyÑ8limxÑ0 1

xytan1xyxy. gK:

1. , Rn ¥m¥ØU¤eZ‡p؃4¥¿.

2. p1q,3Rnpn¥2q¥Kk‡: e8Ü´´ëÏ.

p2q|^\®²y²¯¢y², lRnpn¥2q RëYN،U

ü.

3. fp0q0, f : RnÑRn ±ålN,=

}fpxqfpyq}}xy}, @x, yPRn, f ‚5C†.

2

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