Introduction to the course,ODE(I)

第一章 单元测试

1、单选题:

‌What is the order of the following ODE?

​选项:
A: 1
B: 2
C: 3
D: 4
答案: 【 1

2、单选题:

‏What is the order of the following ODE?

‍选项:
A: 1
B: 2
C: 3
D: 4
答案: 【 2

3、单选题:

‍What is the order of the following ODE?

‏选项:
A: 1
B: 2
C: 3
D: 4
答案: 【 2

4、判断题:

‎Is the following ODE autonomous?

‏选项:
A: 正确
B: 错误
答案: 【 正确

5、判断题:

Is the following ODE autonomous?

‏选项:
A: 正确
B: 错误
答案: 【 错误

6、判断题:

Is the following ODE autonomous?

‏选项:
A: 正确
B: 错误
答案: 【 正确

7、判断题:

‌For the following ODE systems, is the given point a critical point?

‌(0,0) in 

​选项:
A: 正确
B: 错误
答案: 【 正确

8、判断题:

For the following ODE systems, is the given point a critical point?

(0,1) in 

‍选项:
A: 正确
B: 错误
答案: 【 错误

9、判断题:

For the following ODE systems, is the given point a critical point?

(0,0,0) in 

‌选项:
A: 正确
B: 错误
答案: 【 正确

10、判断题:

‌Are functioning{ } linearly independent?

‏选项:
A: 正确
B: 错误
答案: 【 正确

11、判断题:

‌Does  form a basis for the space ?

‏选项:
A: 正确
B: 错误
答案: 【 正确

ODE (II)

第二章 单元测试

1、单选题:

‏For the equation ,we take , then Picard iteration gives  as follows, check out the correct one.

‍选项:
A:
B:
C:
D:
答案: 【 

2、多选题:

,不动点包括:

‌选项:
A: 0
B: 1
C: 2
D: 3
答案: 【 0;
1

ODE (III)

第三章 单元测试

1、单选题:

‌The system  has a critical point:

‍选项:
A: (0,0)
B: (0,1)
C: (1,0)
D: (1,1)
答案: 【 (0,1)

2、单选题:

‎For the system  , the critical point is a ()

‎选项:
A: source
B: sink
C: focus
D: saddle
答案: 【 saddle

3、单选题:

‎In the Duffing equation, the following function is constant along each trajectory 

‎选项:
A:
B:
C:
D:
答案: 【 

4、多选题:

‏If we rewrite Duffing equation as 

‌选项:
A: no center
B: one center
C: one saddle
D: two saddle points
答案: 【 one center;
two saddle points

ODE(IV)

第四章 单元测试

1、单选题:

can be recast into two different ODE systems as follows:

 is a/an ___ node for (1) and a/an ___ node for (2).

​选项:
A: stable,stable
B: stable,unstable
C: unstable,stable
D: unstable,unstable
答案: 【 unstable,unstable

2、单选题:

, ___ is a Lyapunov function.

‎选项:
A:
B:
C:
D:
答案: 【 

3、判断题:
‍There can be a critical point on homoclinic orbit.‏
选项:
A: 正确
B: 错误
答案: 【 正确

4、判断题:
​There can be a critical point on limit cycle.‎
选项:
A: 正确
B: 错误
答案: 【 错误

ODE(V)

第五章 单元测试

1、单选题:

‏For , it undergoes a ____ bifurcation when varies.

‎选项:
A: saddle-node
B: transcritical
C: supercritical
D: none
答案: 【 saddle-node

2、单选题:

‎For , it unde

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