Episode #125 of the Stack Overflow podcast is here. We talk Tilde Club and mechanical keyboards. Listen now
John Hughes

 67 How did mathematicians decide on the axioms of linear algebra 44 Trouble understanding only one way implication truth 39 Can you completely permute the elements of a matrix by applying permutation matrices? 38 How do you calculate a sum over a polynomial? 35 If I have a $0.00048\%$ chance of dying every second, how to numerically calculate the chance I have of dying in a day?

### Reputation (70,785)

 +10 The discrete topology +25 Proving a symmetric group is a subgroup +10 Finding the closest point in a set to another point in n-dimensional space: efficiently +15 what happen to a sequence of matrix if their 2-norm tends to 0

### Questions (10)

 13 Limits and substitution 12 Why do choirs work? 7 Possibly rotated parabola from three points 6 Proving a solution to a double recurrence is exhaustive 6 Integer $2 \times 2$ matrices such that $A^n = I$

### Tags (594)

 815 linear-algebra × 459 324 general-topology × 133 441 calculus × 248 299 real-analysis × 191 424 matrices × 226 211 algebraic-topology × 113 417 geometry × 246 191 abstract-algebra × 75 333 differential-geometry × 194 174 derivatives × 66