1
vote
0answers
39 views

What are some good general estimates?

For example, the triangle inequality for complex numbers and summations is a good one. Also, the ML-Estimate (Estimation Lemma), Cauchy Estimates $|zw|=|z||w|$. As you can probably notice, I really ...
2
votes
1answer
83 views

How to asymptotically estimate a lower bound of this function?

The function is given as $$f(x)\geq \sum_{i=1}^{[x/2]}f(i)+1$$ The boundary condition is $f(0)=0$. What I can get is this function grows faster than any polynomial function, and grows slower than ...