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 Mar5 revised Real analysis book suggestion added 3 characters in body Feb28 revised Matrix convexity! edited tags Feb25 revised Real analysis book suggestion added 132 characters in body Feb23 revised Prove the following based on the triangle inequality edited tags Feb15 reviewed Approve Finding the value of the infinite sum $1 -\frac{1}{4} + \frac{1}{7} - \frac{1}{10} + \frac{1}{13} - \frac{1}{16} + \frac{1}{19} + …$ Feb15 reviewed Reject GCD(a,m)>1 implies ax=1(mod m) has no solution Feb15 reviewed Reject Intersection of line with discrete hypercubes in n-dimensional space Feb12 comment Pseudo Proofs that are intuitively reasonable @user4205580 See math.stackexchange.com/questions/239278/puzzle-on-the-triangle Feb12 reviewed Reject Calculus inequality (easy) Feb10 reviewed Looks OK Matrix equation - find $a,b,c,d$ Feb10 revised Matrix equation - find $a,b,c,d$ Improviment of LaTeX code. Feb10 reviewed Reject Can a sequence be called convergent/divergent if it has finite number of terms? Feb8 revised Limit solving without using L'Hopital rule added 33 characters in body Feb7 revised Prove/disprove: $\forall f\ \in \mathbb N ^{\mathbb R}. \forall x\in \mathbb R. \exists y\in \mathbb R ((f(x)=f(y))\wedge (x\neq y))$ added 211 characters in body Feb7 answered Prove/disprove: $\forall f\ \in \mathbb N ^{\mathbb R}. \forall x\in \mathbb R. \exists y\in \mathbb R ((f(x)=f(y))\wedge (x\neq y))$ Feb5 revised Prove that 1+1=2 added 5 characters in body Feb4 reviewed No Action Needed Multiple Poisson r.v.s - conditional probability given the sum of r.v.s is a specific value Feb4 comment The definition of negation There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs. Feb3 reviewed Approve When is the quotient ring of a multivariable polynomial ring over a field by a monomial ideal an integral domain? Feb2 comment Properties of sup and lim inf. @Vinith How nice it I've helped. And welcome to Mathstackexchange.