### Answers (288)

 15 Algorithm to calculate rating based on multiple reviews (using both review score and quantity) 7 Inverse of an invertible upper triangular matrix of order 3 6 Find matrices $A$ and $B$ such that $rank(A) = rank(B)$ but $rank(A^2) \ne rank(B^2)$ 5 Writing every element of $S_n$ as a product of permutations of order 2 5 Factors of integers of the form $2^n-1$

### Reputation (4,499)

 +15 intersection of row spaces +35 How to find the set of solutions of $Ax=By$ for $A,B$ matrices? +10 Euler's function and cyclicity +10 In how may ways can we remove lines such that all dots will still be connected?

### Questions (45)

 9 What are those groups generated by two cycles? 8 Is this ring a well known ring and if so how is it called? 6 Rational Eisenstein primes that split 5 Which matrix $P$ makes two matrices $A$ and $B$ similar 5 For which finite groups $G$ is $K = \{g^2 \mid g \in G\}$ a subgroup

### Tags (165)

 93 abstract-algebra × 126 21 permutations × 18 73 group-theory × 107 20 number-theory × 36 41 linear-algebra × 45 18 algorithms × 3 38 finite-groups × 42 15 scoring-algorithm 22 matrices × 21 15 recursive-algorithms

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