Zhenduo Cao

### Questions (8)

 5 Is it true? $(1+ta_1)(1+ta_2)\cdots(1+ta_n)=1, \;\forall t\in{\Bbb R}$ ⟺ $a_1=a_2=…=a_n=0$ 3 how to prove that this sequence converges to $0$? 3 What's the variance of intercept estimator in multiple linear regression? 2 Does variance of sample mean converge to zero? 2 For non-differentiable functions, does fundamental theorem of calculus give the subgradient?

### Reputation (114)

 +5 For non-differentiable functions, does fundamental theorem of calculus give the subgradient? +5 What's the variance of intercept estimator in multiple linear regression? +5 Can we interchange integral and limit if the sequence of function is uniformly integrable? +5 For a positive function, can the length of gradient get arbitrarily close to 0?

### Tags (18)

 2 polynomials × 2 0 calculus 0 linear-algebra 0 subgradient 0 determinant 0 sampling 0 linear-regression 0 law-of-large-numbers 0 analysis 0 probability-theory

### Accounts (4)

 Mathematics 114 rep 7 Quantitative Finance 16 rep 1 Stack Overflow 11 rep 2 Cross Validated 1 rep