ratchet freak
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 Jan 20 revised Do We Need the Digits of $\pi$? added 19 characters in body Oct 14 answered Sphere equation given 4 points Oct 11 awarded Yearling Sep 25 revised Explaining percentages added 24 characters in body Jul 12 comment How to prove that the Fibonacci sequence is periodic mod 5 without using induction? @lulu but you can know the max period is 25 because that's how many pairs of numbers there are mod 5. Jul 12 comment How to prove that the Fibonacci sequence is periodic mod 5 without using induction? No-one used the closed form and expanded it out in the answers? Mar 6 comment How is another root -i? @SophieClad that is only true of quadratic equations with coefficients in R Feb 20 awarded Nice Answer Feb 18 answered How to find the linear matrix of this linear transformation? Feb 13 awarded Nice Answer Feb 12 revised Is there a commutative operation for which the inverse of the operation is also commutative? edited body Feb 12 answered Is there a commutative operation for which the inverse of the operation is also commutative? Feb 11 revised Is there a size of rectangle that retains its ratio when it's folded in half? fixing the formatting Feb 11 suggested approved edit on Is there a size of rectangle that retains its ratio when it's folded in half? Jan 9 comment Why is inverse of orthogonal matrix is its transpose? actually it's not: [[2,0][0,2]] is orthogonal but its inverse is [[0.5,0][0,0.5]]. I think you mean orthonormal Dec 15 awarded Caucus Nov 13 comment Why is the absolute sign needed in the definition of a bounded function +1 for going to the intent of the notation Nov 5 awarded Custodian Nov 5 reviewed Approve Finding Transformation matrix between two 2D coordinate frames [Pixel Plane to World Coordinate Plane] Oct 11 awarded Yearling