# Chris

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 Nov16 asked The forever moving billiard ball Oct2 comment Surprising identities / equations How is this formula not immediately obvious? Oct2 awarded Good Answer Sep30 awarded Nice Answer Sep29 revised closed form $f_n=\sqrt{2f_{n-1}}$ ? added 2 characters in body Sep29 comment closed form $f_n=\sqrt{2f_{n-1}}$ ? So f_1 = 2^(1 + 3/4) ?, but I thought f_1 was 2^(1/2) Sep29 answered closed form $f_n=\sqrt{2f_{n-1}}$ ? Sep29 comment Surprising identities / equations This topic seems very intriguing, so thanks for posting +1. Sep28 comment Surprising identities / equations @DanielV, it does lead to a paradox. The sum from 1 to infinity of 2^k = 2 + 2 + 2 + 2 etc. = -1 (our assumption). Now 2 = 1+1. Therefore 1 + 1 + 1 + 1 + 1 = -1. But the sum from 1 to infinity of 1^k = -1/2. Sep28 answered Surprising identities / equations Sep28 comment Surprising identities / equations How can the sum from 1 to infinity of positive integers lead to a negative number? Sep11 comment Blue eyes: a logic puzzle @IttayWeiss, what is an example of a harder logic problem? Sep8 awarded Yearling Jun10 awarded Popular Question May14 awarded Caucus Feb6 comment Find a function that that makes the value of this improper integral equal to 1. Thanks for your answer. Feb6 comment Find a function that that makes the value of this improper integral equal to 1. I wasn't sure about the title. Please feel free to correct. Feb6 accepted Find a function that that makes the value of this improper integral equal to 1. Feb6 asked Find a function that that makes the value of this improper integral equal to 1. Feb1 comment How is this linear 2nd-order ODE solved? My solution accidentally solved for equation (11) instead of (14) oops