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 Aug15 asked Is probability and the Law of Large Numbers a huge circular argument? Aug12 awarded Investor Aug12 accepted Keep on getting wrong value for linear regression $\beta$ estimator derivation Aug10 comment Does the series $1 + \frac{1}{2} - \frac{1}{3} + \frac{1}{4} + \frac{1}{5} - \frac{1}{6} + \dots$ converge? This series actually converges by the alternating series test. This is a theorem that states that if an infinite series is alternating, then it converges iff the $n^{\text{th}}$ term goes to $0$ as $n$ goes to $\infty$. Aug8 accepted Is this the correct way to derive the generating series? Aug8 accepted Generating functions for election results Aug8 accepted Proving the existence of a unique planar embedding Aug2 asked Proving the existence of a unique planar embedding Aug2 comment What is the absolute minimum that must be accepted/defined in order to prove 1+1=2? I think the Peano axioms would do perfectly. And of course a definition of the decimal system, since peano axioms are written in essentially a unary system. Aug2 comment Proving that a “prime graph” is connected Hmm. I wonder why induction is so useful in graph theory - I should really start using it more rather than crutching everything using proofs by contradiction (which also seem to appear way more often in graph theory). Aug1 accepted Proving that a “prime graph” is connected Aug1 asked Proving a fact about 4-regular graphs Aug1 comment Proving that a “prime graph” is connected What is that? I haven't learned anything like that. Aug1 asked Proving that a “prime graph” is connected Aug1 asked Generating functions for election results Aug1 asked Is this the correct way to derive the generating series? Jul28 asked Four-color theorem from triangleless graphs Jul26 comment Proving that a map formed by a closed curve is always 2-colorable Also, why is each vertex of even degree? Jul25 comment Proving that a map formed by a closed curve is always 2-colorable Oh I see. Then coloring faces :). I vaguely remember a theorem stating the two are equivalent though... Jul24 comment Proving that a map formed by a closed curve is always 2-colorable The question wants me to color the vertices.