31 Going from a value inside $[-1,1]$ to a value in another range 19 Prove that lim $(\sqrt{n^2+n}-n) = \frac{1}{2}$ 15 Proof of analogue of the Cauchy-Schwarz inequality for random variables 13 Showing that complex exponentials of the Fourier Series are an orthonormal basis 9 What is the relation between analytical Fourier transform and DFT?

### Reputation (9,532)

 +10 LTI system with sinc input and unit impulse output? +10 When is the Fourier Transform of a function periodic? +10 Showing that complex exponentials of the Fourier Series are an orthonormal basis +10 Simple identity involving complex numbers

### Questions (2)

 5 Inequalities involving arithmetic, geometric and harmonic means 0 recursive sequence of nested intervals: how to find the limit value [duplicate]

### Tags (133)

 155 fourier-analysis × 100 44 complex-numbers × 22 71 signal-processing × 69 36 laplace-transform × 30 60 linear-algebra × 33 36 trigonometry × 19 57 fourier-series × 30 35 transformation × 6 56 calculus × 28 34 arithmetic × 2