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### Questions (25)

 5 Is there a dimension which extends to negative or even irrational numbers? 3 Basic combinatorics question. Select two teams from boys and girls. 3 Do we still need probabilistic primality testing methods for practical applications? 2 Find smallest discrete logarithm, knowing some discrete logarithm. 2 When change making problem has an optimal greedy solution?

### Reputation (315)

 +5 If $f(n) = \sum_{i = 1}^{n} (n / i) \log(n / i)$ and $g(n) = n ~ {\log^{2}}(n)$, then is $O(f) = O(g)$? +10 Find smallest discrete logarithm, knowing some discrete logarithm. +5 Error in approximating the sum +10 YCbCr to RGB conversion with given matrix

 2 YCbCr to RGB conversion with given matrix 1 Simplify a sum of binomial 1 How can I find the order of growth of this recurrence: $T(n) =\sqrt{n}T\bigl(\sqrt{n}\bigr) + n$ 0 What does it mean to preserves the subspaces in Gram-Schmidt orthogonalization? 0 Complex no maximization

### Tags (36)

 2 matrices 0 linear-algebra × 6 1 summation × 5 0 number-theory × 3 1 combinatorics × 3 0 least-common-multiple × 2 1 recurrence-relations × 2 0 calculus × 2 1 recursion × 2 0 orthogonality × 2

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