Chapter 1 复数与复变函数 Flashcards

1
Q

复数的方根

A

根:模是开n次,辐角是(0+2kPai/n),k=0~n-1.
所以开n次方就存在n个根。
物理意义:开n次模为半径,圆内接正n边形顶点。

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2
Q

辐角主值

A

-Pi到Pi范围的辐角(不包括-Pi)

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3
Q

|Z|^2=?

A

Z*Z共轭

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4
Q

乘积/商的模值

A

模值的乘积/商

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5
Q

光滑曲线

A

X Y一阶导数连续,一阶导数平方和不为零。

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6
Q

i的乘幂的变化

A

T=4, i, -1, -i, 1

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7
Q

cos(Z)的共轭=

A

cos(Z的共轭)

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8
Q

反正切求辐角

A

反正切求的永远在+-1/2 Pi, 要变换到所在的+-Pi

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9
Q

极限 定义

A

z–任意方式–>z0;则f(z)–>A

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10
Q

极限 充要条件

A

f(z)–>A充要条件:u–>u0, v–>v0

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11
Q

极限 四则运算

A

两函数极限存在,和差积商的极限也存在且直接算

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12
Q

连续 定义

A

极限值等于函数值

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13
Q

连续 充要条件

A

两个二元函数分别在点处连续

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14
Q

连续 四则运算

A

z0处,+-*/仍连续; 复合函数从内到外一次连续

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