Douglas S. Stones
Reputation
14,629
Top tag
Next privilege 15,000 Rep.
Protect questions
 Sep23 revised Prove that $\sum_{k=0}^r {m \choose k} {n \choose r-k} = {m+n \choose r}$ edited tags Sep23 revised How to calculate no. of binary strings containg substring “00”? edited tags Sep23 revised How to solve this using using stirling approx? edited tags Sep12 revised “Monotone Convergence Theorem” $\implies$ “least upper bound property” edited tags Sep12 revised Binomial and series with 2 coefficients Fixed error Sep2 revised Counting the number of subgraphs isomorphic with the following digraph added 107 characters in body Aug31 revised Factorising complex equations edited tags Aug30 revised A problem on limit added 137 characters in body Aug30 revised Find order of $xy$ provided $x^2=e, y^3=e$ and $yxy=xy^2x$ added 8 characters in body; edited tags; edited title Aug29 revised How is $\{ (1/n , 1 + 1/n) \}_{n \geq 1}$ a cover for $(0,2)$? edited title Aug29 revised Problem on directed graph involving $\gcd$ Added drawing of graph Aug29 revised Calculate the Determinant? Neatened it up; corrected arithmetic. Aug28 revised $\frac1a+\frac1b+\frac1c=0 \implies a^2+b^2+c^2=(a+b+c)^2$? edited tags Aug28 revised mean of two consecutive number helps proving both number equals.. edited tags Aug28 revised How do I explain the fallacy $\frac00=2$ in this case? edited tags Aug28 revised Critique on a proof by induction that $\sum_{i=1}^n i^2= n(n+1)(2n+1)/6$? re-titled; re-tagged Aug28 revised Simultaneous solution(s) to $a^2+4b^2+4ab=0$ and $a^2+4b^2+32+16a-8b=0$? re-titled; re-tagged Aug27 revised Area of a region between curves and a point. edited tags Aug27 revised Find an algorithm to compute $(1! \cdot 2! \cdot3!\cdots n! ) \,\%\, x$. edited tags Aug25 revised Determine all possible automorphisms of a graph Added drawing; other minor touch-ups.