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 Jan 8 revised Relation between ranks of submatrices of a matrix. format with latext Jan 8 reviewed Leave Open The number of real roots of $x\lfloor x\rfloor+187=\lfloor x^{2}\rfloor+\lfloor x\rfloor$ Jan 7 comment How to solve instant insanity puzzle with graphs. @SteveKass "Probably not" is probably wrong. Even if it isNP-complete it is possible that it can be solved for input of small size. Jan 7 comment How to solve instant insanity puzzle with graphs. Photos are not useful especially if the numbers cannot be read because they are written to small. Put the data in an appropriate format: 3-column list. The first column is the label of the edge (the cube number) the second is the name of the the vertex of the edge with the smaller number (color) and the third column is the other vertex of the edge. But don't add a photo of the list to the post but add it as code (each line is preceded by four whitespace) so that one can copy and paste the data. Jan 7 comment How to find out the number of ways to solve Instant Insanity In Donald Knuth's paper Estimating the Efficiency of Backtrack Programs you can find an explanation. Jan 5 comment Prove that if Triangles ABC = DEF in a metric geometry, then line AB contains exactly two of the points D, E, and F. "Clearly $\overleftrightarrow{AB}$ cannot intersect any other side at any other point." Any other side of $\bigtriangleup ABC$ or of $\bigtriangleup DEF$ ? Jan 5 revised Prove that if Triangles ABC = DEF in a metric geometry, then line AB contains exactly two of the points D, E, and F. latex, overleftrightarrow Jan 4 comment Prove that if Triangles ABC = DEF in a metric geometry, then line AB contains exactly two of the points D, E, and F. definitions can be found here: math.furman.edu/~dcs/courses/math36/assignments.html Jan 4 revised Prove that if Triangles ABC = DEF in a metric geometry, then line AB contains exactly two of the points D, E, and F. latex Jan 4 revised Prove that $f(x,y)=g(x+y,xy)$. typo Jan 4 reviewed Approve To solve the following integral: $\int _0 ^{2\pi} y e^{ab\cos\left(k y\right)}\, \mathrm{d}y$ Jan 1 revised Shortest distance to a straight line link to construction Jan 1 comment Shortest distance to a straight line @copper: If it is the same why did you add this "Alternative" paragraph to your post afterwards? Jan 1 answered Shortest distance to a straight line Dec 31 revised Reverse Functions format Dec 31 awarded Necromancer Dec 29 answered Max perpendicular distance between line and parabola Dec 29 revised Max perpendicular distance between line and parabola display picture in post Dec 29 revised Find the area of a triangle if its two sides measure $6 in.$ and $9 in.$, and the bisector of the angle between the sides is $4\sqrt{3}$ in. removed unit from latex Dec 26 reviewed Approve $\int\frac{\sqrt{\ln x}}{x}\ dx$