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### Questions (13)

 5 Hairy ball theorem: Do the poles have to be opposite each other? 5 Do rational and irrational numbers flip-flop? 4 Finding the period of the solution to $y'(x) = y(x) \cdot cos(x + y(x))$ with Fourier transform; how to interpret complex result? 3 How do you pack circles into a circle? 3 Optimizing screening sample size

### Reputation (1,835)

 +25 Hairy ball theorem: Do the poles have to be opposite each other? +10 Hairy dog theorem +40 On “familiarity” (or How to avoid “going down the Math Rabbit Hole”?) +5 How do you pack circles into a circle?

 125 On “familiarity” (or How to avoid “going down the Math Rabbit Hole”?) 19 How do I explain the Königsberg Bridge problem to a child? 17 Stopping the “Will I need this for the test” question 15 A problem V.I. Arnold solved as a primary school student 2 A logic problem. No need for calculation

### Tags (37)

 159 soft-question × 4 19 graph-theory 125 self-learning 15 education × 3 19 discrete-mathematics 15 algebra-precalculus × 2 19 eulerian-path 15 math-history 19 general-topology 15 popular-math

### Accounts (64)

 Stack Overflow 5,965 rep 72573 Academia 4,151 rep 21743 Biology 2,288 rep 11235 Mathematics 1,835 rep 1818 Server Fault 1,398 rep 1610