Raphael
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 Apr 1 awarded Nice Answer Mar 14 comment Regular expressions: Show that A*B is the solution of X = AX + B You show this the way you solve any set equality. Feb 5 awarded Good Answer Feb 1 comment Limit of the sequence defined by a recurrence And that gives them what? You should elaborate how that actually answers the question. Dec 4 awarded Pundit Nov 12 comment How to read Hasse diagrams and how they can describe a Boolean Algebra? @avDec25 Better solutions: 1) Get rid of redundant image #2 in favor of MathJax. 2) Post the third image as link and wait for editors to make it an image link. Nov 12 comment How to read Hasse diagrams and how they can describe a Boolean Algebra? What's with that abomination of an ASCII "art"? Nov 9 awarded Yearling Oct 15 awarded Good Question Sep 9 comment I roll a die repeatedly until I get 6, and then count the number of 3s I got. What's my expected number of 3s? Recursive random variables -- neat idea, haven't encountered this before (outside of average-case analysis of recursive algorithms). Jun 12 comment Reorder adjacency matrices of regular graphs so they are the same I think you are asking to solve (sub)graph isomorphism. For general graphs, we don't know a polynomial-time algorithm for either. That does not preclude better algorithms for your restricted class; I recommend a literature search with "(sub)graph isomorphism" and "regular graphs". Jun 9 comment How n (1+b) is not prime? Jun 8 comment Determine whether the given set is countable This seems to be a pure mathematics question. Is there a particular reason you are asking computer scientists instead of mathematicians? Apr 7 awarded Civic Duty Mar 16 comment Achieving a target least common multiple Please make clear how this is a computer science question. We can also migrate to Mathematics if you prefer. Feb 18 comment What does the sign that looks like $\geq$ except with the bottom line being sloped mean? @Greenonline If you (have to) use this outside source code, something is terribly wrong. Feb 17 comment What does the sign that looks like $\geq$ except with the bottom line being sloped mean? Every reasonable mathematics font will have both; usage is a matter of personal, stylistic choice. Feb 17 comment What does the sign that looks like $\geq$ except with the bottom line being sloped mean? @DaveClarke They are actually two different symbols, ≤ (Less-Than or Equal To) and ⩽ (Less-Than or Slanted Equal To). Feb 10 comment Clique vs genus What have you tried and where did you get stuck? Jan 16 comment Abstract Algebra in analyzing computer science