Douglas S. Stones
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 Sep 10 reviewed Leave Closed If g(f(x)) is one-to-one (injective) show f(x) is also one-to-one (given that…) Sep 10 reviewed Leave Closed Is square root of an integer, either an integer or an irrational number, but never (non-integer) rational? Sep 10 reviewed Leave Closed Weird E letter? (sigma) Sep 10 reviewed Leave Closed Sum of n consecutive numbers Sep 10 reviewed Leave Closed Puzzle - where did the extra dollar come from? Sep 10 reviewed Leave Closed How come the number $N!$ can terminate in exactly $1,2,3,4,$ or $6$ zeroes but never $5$ zeroes? Sep 10 reviewed Leave Closed Best Fake Proofs? (A M.SE April Fools Day collection) Sep 10 reviewed Leave Closed Which one is preferred: $r2^m$ or $2^m r$? Sep 10 reviewed Leave Closed A simple yet confusing puzzle - Fake money involved! Sep 10 reviewed Leave Closed The union of kernels is a proper subspace Sep 10 reviewed Reopen Why is it important that a basis be orthonormal? Sep 10 reviewed Leave Closed What is the most number of regions that 9 lines can cut the plane into Sep 9 comment Finding the last two digits of a number by binomial theorem Does, "compute the number" count as any other way? The number is 108347059433883722041830251. Sep 7 answered What is the probability of guessing an IP correctly? Sep 5 comment Solving a system of equations using modular arithmetic modulo 5 Print(Concatenation([":",")"]),"\n"); Sep 5 answered Solving a system of equations using modular arithmetic modulo 5 Sep 4 asked Is there a better way to input an $n$-cycle in GAP? Sep 3 answered An abelian group of a certain order Sep 2 comment Find the sum of all 4-digit numbers formed by using digits 0, 2, 3, 5 and 8? I know how you feel. But it is useful to know how to solve problems computationally too, even if it is just to check human-written solutions. (By the way, what language is this?) Sep 2 revised Counting the number of subgraphs isomorphic with the following digraph added 107 characters in body