Peter Phipps
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 Apr 26 revised What's the solution to this puzzle? Title and tags Apr 26 suggested approved edit on What's the solution to this puzzle? Apr 21 comment Concatenating the first n semiprimes (in order) to get a semiprime $469101415$… The two factors of $46910\dots129$ are $561142648578701032870967$ and $83597533782255928599777933064811804102379251037232937344874950747087$ Apr 10 revised How to determine is a matrix is invertible? Better title and grammar Apr 10 suggested approved edit on How to determine is a matrix is invertible? Apr 7 comment Scientific calculator @user3699621, There are online calculators that do what you want, for example here. Apr 4 comment Extensive Logarithm Question @egreg, $2^{x+1} = 2^{x+1} + 2^{x+1}$. Now subtract $2^{x+1}$ from each side. Mar 31 revised Log value to absolute Added image to question and sundry edits. Mar 31 suggested approved edit on Log value to absolute Mar 29 revised Verify correctness of this PDA Added image to the question. Mar 29 suggested approved edit on Verify correctness of this PDA Mar 23 reviewed Reviewed Simplifying Integral Expression w/ Antiderivative Mar 4 reviewed Reviewed If $R=\{(x,y): x\text{ is wife of } y\}$, then is $R$ transitive? Mar 1 comment Problem of two scales in a corridor @Hamza, no the height $h$ is not dependent on the length $x$. If you draw the picture several times with the same values of $y$ and $z$ you will see that $h$ is always the same. (Assuming that you mean that $y$ and $z$ are perpendicular to $x$ as drawn in the picture.) Feb 19 reviewed Reviewed Combinatorics problem - Distribute cakes amongst peers Feb 19 reviewed Reviewed Clarification about percentage calculus Feb 12 revised What type of discontinuity is found in this graph? Added graph in to question, added tags Feb 12 suggested approved edit on What type of discontinuity is found in this graph? Feb 11 revised Ratios of the major axes of ellipses inscribed in a triangle Title, texification, tags Feb 11 suggested approved edit on Ratios of the major axes of ellipses inscribed in a triangle