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 Sep 17 awarded Citizen Patrol Sep 12 comment Are there “numbers” with infinite number of digits (to the left) and are they useful? Maybe start with something simple: how would you convert such a number from decimal to binary for example? Sep 10 accepted Proving that similar matrices have identical ranks Sep 9 asked Proving that similar matrices have identical ranks Sep 5 comment Why do you add +1 in counting test questions? It's sad to see "add 1 to counting test problems" being taught as one of those "rules"... Aug 25 comment Paradoxes without self-reference? The liar paradox and also the "set of all sets" paradox seem to be true paradoxes, revealing incompleteness of certain systems of logic or set theory. Aug 25 comment Paradoxes without self-reference? Also this is not actually a paradox but a misunderstanding of infinite series. Aug 16 comment Is this a new function? There are an infinite amount of functions to "discover." Aug 15 asked Is probability and the Law of Large Numbers a huge circular argument? Aug 12 awarded Investor Aug 12 accepted Keep on getting wrong value for linear regression $\beta$ estimator derivation Aug 10 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 $\infty$. Aug 8 accepted Is this the correct way to derive the generating series? Aug 8 accepted Generating functions for election results Aug 8 accepted Proving the existence of a unique planar embedding Aug 2 asked Proving the existence of a unique planar embedding Aug 2 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. Aug 2 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). Aug 1 accepted Proving that a “prime graph” is connected Aug 1 asked Proving a fact about 4-regular graphs